Cited by 110Context-Aware Activity Recognition SystemsTechnology Use by Older AdultsPhysical Activity and Health

Advanced Sensing and Human Activity Recognition in Early Intervention and Rehabilitation of Elderly People

Open access
Schrader, Lisa, Vargas Toro, Agustín, Konietzny, Sebastian, Rüping, Stefan, Schäpers, Barbara, Steinböck, Martina, Krewer, Carmen, Müller, Friedemann +2 more·2020·Journal of Population Ageing

Abstract

Ageing is associated with a decline in physical activity and a decrease in the ability to perform activities of daily living, affecting physical and mental health. Elderly people or patients could be supported by a human activity recognition (HAR) system that monitors their activity patterns and intervenes in case of change in behavior or a critical event has occurred. A HAR system could enable these people to have a more independent life. In our approach, we apply machine learning methods from the field of human activity recognition (HAR) to detect human activities. These algorithmic methods need a large database with structured datasets that contain human activities. Compared to existing data recording procedures for creating HAR datasets, we present a novel approach, since our target group comprises of elderly and diseased people, who do not possess the same physical condition as young and healthy persons. Since our targeted HAR system aims at supporting elderly and diseased people, we focus on daily activities, especially those to which clinical relevance in attributed, like hygiene activities, nutritional activities or lying positions. Therefore, we propose a methodology for capturing data with elderly and diseased people within a hospital under realistic conditions using wearable and ambient sensors. We describe how this approach is first tested with healthy people in a laboratory environment and then transferred to elderly people and patients in a hospital environment. We also describe the implementation of an activity recognition chain (ARC) that is commonly used to analyse human activity data by means of machine learning methods and aims to detect activity patterns. Finally, the results obtained so far are presented and discussed as well as remaining problems that should be addressed in future research.

AI snapshot

Written from the paper’s full text.

TL;DR

The paper presents a methodology for collecting wearable and ambient sensor data from elderly people and patients in a hospital to build a human activity recognition (HAR) dataset focused on clinically relevant daily activities, and describes an activity recognition chain (ARC) using a Random Forest classifier. Preliminary ARC results on the public Opportunity dataset outperform challenge baselines, but annotation and evaluation on the newly collected elderly/patient data remain in progress.

Key findings

  • Data acquisition proceeded in two stages: first with 5 healthy participants aged 24–55, then with 15 participants consisting of 8 healthy elderly persons (5 men, 3 women; aged 67–86, mean 74.4 years, SD 6.5) and 7 neurological patients (5 men, 2 women; aged 30–84, mean 64.0 years, SD 17.5). In total, 56 ADL sessions and 37 ASI sessions were recorded, totaling 19:39:48 recording minutes.
  • Clinically relevant activities were selected as activities of special interest: changing positions in bed, getting out of bed, using the toilet, drinking, and eating.
  • The first ARC version, trained and tested on the public Opportunity dataset, achieved F-scores of 0.87 for locomotion and 0.90 for hand gestures, compared with challenge results such as 1-NN (0.84 locomotion, 0.87 hand gestures), 3-NN (0.85, 0.85), and CStar (0.63, 0.88).
  • Among 8 healthy elderly participants, general technical affinity measured by the TA-EG questionnaire had a mean of 3.0 points (SD 0.6); enthusiasm for technology was the lowest dimension, while positive attitude towards technology showed the highest individual ratings.

Methods

  • Two-stage data acquisition methodology: healthy participants were recorded in a laboratory test apartment at TUM and a hospital environment at SKBA; elderly people and patients were then recorded in a conventional patient room at SKBA. Sessions followed ADL and ASI activity protocols, with wearable sensors (9 activPAL monitors, 2 Myo armbands, 1 SmartCardia prototype) and ambient sensors (Tekscan BPMS, stationary and hand cameras).
  • The ARC implementation includes sensor data acquisition, preprocessing, segmentation, feature extraction and selection, and classification; a Random Forest classifier was selected, and annotation used a hierarchical annotation vocabulary covering high-level, mid-level, low-level activities, modes of locomotion, and object interactions.
  • Proof of concept was conducted on the publicly available Opportunity dataset; evaluation metrics included F-score and frame/event analysis. The newly collected HAR database was still being annotated.

Limitations

  • Stated in the paper: the annotation process of the HAR database is currently in progress, so the database is not yet ready for model evaluation; specific medical aspects of the patients are not included; the SmartCardia wearable could not be used in the final trial due to a missing CE certificate; the activity protocol was kept flexible and fewer sessions were executed depending on patient condition.
  • Stated in the paper: the preliminary ARC results are only from the Opportunity dataset, which was measured with healthy and young persons only; evaluation using data from elderly people and patients remains future work.
  • Evident from the text: the target-group dataset is small (8 elderly persons and 7 neurological patients), and no classification performance on the newly collected elderly/patient data is reported.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1007/s12062-020-09260-z

Cites

40 of 40 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

0 of 45 cited sources checked · 0 supported · 0 flagged

  • Findingown data

    Data from five healthy participants were collected in two different laboratory environments at TUM and SKBA.

    “All in all, data from five different healthy participants were collected in two different laboratory environments at TUM and SKBA.”
    Quote in the paperNot a substantial claim
  • Findingown data

    No technical difficulties are to be expected in the hospital environment.

    “The first stage of our data acquisition methodology showed that no technical difficulties are to be expected in the hospital environment.”
    Quote in the paperNot a substantial claim
  • Findingown data

    The 5XSST values for patients ranged from 15.9 to 31.5 s with a mean of 21.8 s (SD 7.0).

    “The values ranged from 15.9 to 31.5 s with a mean of 21.8 s (SD 7.0).”
    Quote in the paperNot a substantial claim
  • Findingown data

    The hand grip force for healthy elderly people ranged from 16.6 to 35.7 kg with a mean of 26.0 kg (SD 6.8).

    “The hand grip force ranged from 16.6 to 35.7 kg with a mean of 26.0 kg (SD 6.8).”
    Quote in the paperNot a substantial claim
  • Findingown data

    The 5XSST values for healthy elderly people ranged from 7.2 to 10.0 s with a mean of 8.6 s (SD 1.1).

    “The values of the 5XSST were in the range from 7.2 to 10.0 s with a mean of 8.6 s (SD 1.1).”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim. 52
  • May combine two claims. 33
  • The quote only partly states this claim. 2
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Findingown data

    In the first stage, data from a total of five healthy persons were recorded: four in the laboratory environment and one in the hospital environment, with ages ranging from 24 to 55 years.

    “In this first stage, data from a total of five healthy persons were recorded.There were recorded data of four persons in the laboratory environment and of one additional participant in the hospital environment.Their age was in the range of 24 to 55 years.”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim.

    Findingnone given

    The data acquisition of several sessions one after the other is physically demanding.

    “Although the recorded activities are part of daily life, the data acquisition of several sessions one after the other is physically demanding.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Findingown data

    The prototypic SmartCardia wearable could not be used due to a missing CE certificate.

    “The only change of technical equipment concerned the prototypic SmartCardia wearable, which could not be used due to a missing CE certificate.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Findingnone given

    The most time-consuming task in data acquisition was storing the data.

    “It also demonstrated that the most time-consuming task was storing the data.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    Overall, 15 participants were recruited: eight elderly persons and seven neurological patients.

    “Overall, we recruited a group of 15 participants consisting of eight elderly persons and seven neurological patients.”
    • Also stated in: § Results · plain
      “During this trial, eight healthy elderly persons and seven neurological patients participated.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Findingown data

    The 5XSST could be performed only by 4 patients as 3 patients were not able to stand up without an assistive device.

    “The 5XSST could be performed only by 4 patients as 3 patients were not able to stand up without an assistive device.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Findingnone given

    All patients were in rehabilitation phase B.

    “All patients were in rehabilitation phase B.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Findingown data

    The neurological patient group consisted of 5 men and 2 women aged 30 to 84 years with a mean age of 64.0 years (SD 17.5).

    “The group consisted of 5 men and 2 woman aged 30 to 84 years with a mean age of 64.0 years (SD 17.5).”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingnone given

    The selected group of neurological patients represented different levels of motor and cognitive function: two patients after ischaemic stroke, two with Parkinson's Disease, one with Guillain-Barré-Syndrome, one with Alzheimer's Disease and one with Multiple Sclerosis.

    “The selected group of neurological patients represented different levels of motor and cognitive function: two patients after ischaemic stroke, two with Parkinson's Disease, one with Guillain-Barré-Syndrome, one with Alzheimer's Disease and one with Multiple Sclerosis.”
    Quote in the paperNot a substantial claim
  • The quote only partly states this claim.

    Findingown data

    The hand grip force for patients ranged from 8.9 to 36.5 kg with a mean of 16.7 kg (SD 9.8).

    “The hand grip force ranged from 8.9 to 36.5 kg with a mean of 16.7 kg (SD 9.8).”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Findingown data

    The group of healthy elderly people consisted of 5 men and 3 women aged 67 to 86 years with a mean age of 74.4 years (SD 6.5).

    “The group of healthy elderly people consisted of 5 men and 3 women aged 67 to 86 years with a mean age of 74.4 years (SD 6.5).”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Findingreasoning

    The generation of labeled training data is a very time-consuming task.

    “On the other hand, the generation of labeled training data also becomes a very time-consuming task.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Findingown data

    So far, a selection of mid-level activities has been annotated: washing hands, brushing teeth, toileting, pull up/down the pants, eating, drinking, pill taking and the corresponding hand gestures for the last two.

    “So far we have annotated a selection of mid-level activities, which are washing hands, brushing teeth, toileting, pull up/down the pants, eating, drinking, pill taking and the corresponding hand gestures for the last two.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Findingnone given

    The annotation process of the HAR database is currently in progress.

    “The annotation process of the HAR database is currently in progress.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Findingown data

    Enthusiasm for technology resulted to be the lowest dimension, but the participants' ratings showed the highest value in positive attitude towards technology for each individual.

    “Enthusiasm for technology resulted to be the lowest dimension, but nevertheless the participants' ratings showed the highest value in positive attitude towards technology for each individual.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Findingown data

    Although all healthy elderly persons were highly interested and motivated in participating in a study aiming at a monitoring or intervention system, their overall general technical affinity was only moderate with a mean value of 3.0 points (SD 0.6).

    “Although all healthy elderly persons were highly interested and motivated in participating in a study aiming at a monitoring or intervention system, their overall general technical affinity was only moderate with a mean value of 3.0 points (SD 0.6).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Ageing is associated with a decline in physical activity and a decrease in the ability to perform activities of daily living, affecting physical and mental health.

    “This increase has proved to be a major challenge to the healthcare system, since ageing is associated with a decline in physical activity, affecting physical and mental health.Strategies are needed to enable older people to continue their daily living, prevent diseases or support in rehabilitation, which is costly to individuals and the healthcare system (WHO 2002).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites WHO 2002

      Not checked in the free run.

  • Classified as probably not a substantial claim.

    Interpretationreasoning

    A HAR system can support elderly or diseased people by detecting their activity patterns and intervening in case of changes in behaviour or a critical event.

    “A HAR system based on an ARC can then be used to support elderly or diseased people by detecting their activity patterns and intervening in case of changes in behaviour or a critical event (e.g. by sending recommendations or information to the person affected).”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Perfect segmentation of activities is difficult because humans perform activities in a fluent way and segmentation of time series into intervals representing single activities is not straightforward.

    “While the HAR problem seeks to find a perfect segmentation of activities, this task is difficult to achieve since humans perform activities in a fluent way and the segmentation of time series into intervals that represent single activities is not straightforward (Bulling et al. 2014).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Bulling et al. 2014 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Data collection for HAR is challenging and time-consuming and involves general challenges on data collection, synchronization and multi-modal sensor arrangements.

    “The data collection for HAR is a challenging and time consuming task that involves general challenges on data collection, synchronization and multi-modal sensor arrangements (Calatroni et al. 2011).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Calatroni et al. 2011 source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S4 (based).

    Interpretationreasoning

    A HAR system can enable elderly or diseased people to have a more independent life.

    “A HAR system could enable these people to have a more independent life.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Most research in HAR follows a specific sequence of processing principles called the activity recognition chain (ARC).

    “Most research in the HAR context follows a specific sequence of processing principles to interpret human activities from sensor data, called activity recognition chain (ARC) (Roggen et al. 2010).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Roggen et al. 2010 source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisereasoning

    Machine learning algorithms are widely used for the development of HAR systems to recognize patterns of human activity in sensor data.

    “Therefore, machine learning algorithms are widely used for the development of HAR systems in order to recognize patterns of human activity in the sensor data.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Premisecitation

    Human activity is highly diverse and recognition of specific activities requires accurate selection of sensors and their placement.

    “The second aspect that goes along with this is that human activity is highly diverse and the recognition of specific activities therefore requires an accurate selection of sensors and their placement (Bulling et al. 2014).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Bulling et al. 2014 source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisereasoning

    Most work in HAR divides measurements into fixed intervals and recognizes the activity that took place within each interval, known as the relaxed HAR problem.

    “Therefore, most of the work in HAR is dedicated to dividing the measurements into fixed intervals and to recognize the activity that took place within each interval.This is known as the relaxed HAR problem and an example is shown in Fig. 1 (Bulling et al. 2014).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Bulling et al. 2014 source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Datasets for HAR are typically recorded in controlled environments, where persons wear body sensors and perform a series of scripted activities.

    “Datasets for HAR are typically recorded in controlled environments, where persons wear body sensors and perform a series of scripted activities (Vargas Toro 2018).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Vargas Toro 2018

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    The Opportunity dataset was selected for a proof of concept because of the amount and location of wearable sensors, difference of types and complexity of target activities, relevance of target activities in a real life setting, and quantity of participants.

    “This public dataset was chosen because of the amount and location of wearable sensors, difference of types and complexity of the target activities, relevance of the target activities in a real life setting, and quantity of participants in the data collection sessions (Vargas Toro 2018).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites Chavarriaga et al. 2013 source

      Not checked in the free run.

    • cites Vargas Toro 2018

      Not checked in the free run.

  • Classified as probably not a substantial claim.

    Premisereasoning

    To cope with intraclass variability, data from several subjects needs to be collected so that the variability of single activities can be learned by the model.

    “To cope with intraclass variability, data from several subjects needs to be collected, such that the variability of single activities can be learned by the model.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Collecting large datasets including many samples from target activities copes with the NULL class problem and interclass similarity, and the increased learning stage allows discovery of more complex patterns that enable differentiation between similar classes and NULL class activities.

    “The NULL class problem and the interclass similarity are coped by collecting large datasets including many samples from the target activities.Consequently, the learning stage of the models increases allowing to discover more complex patterns that effectively enables to differentiate between similar classes and NULL class activities (Vargas Toro 2018).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Vargas Toro 2018

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisenone given

    Ground truth labeling is highly time-consuming and is mostly done by first recording the data collection session on video and then labeling the performed activities based on these recordings.

    “Moreover, the ground truth labeling (assigning a ground truth label to each time stamp of the data stream, which is also called annotation for short) is a highly timeconsuming task.It is mostly done by first recording the data collection session on video and then labeling the performed activities based on these recordings.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S2 (checkable).

    Interpretationreasoning

    The proposed approach will increase the chance to generate data for classifiers that are compatible for patient analysis in the future.

    “This approach will therefore increase the chance to generate data for classifiers, which are compatible for patient analysis in the future.”
    Quote in the paperNot a substantial claim
    • Rests on an assumption: Healthy people move much faster and safer than elderly or diseased people, and the type of disease also affects movements.
  • May combine two claims.

    Premisecitation

    Measurement of ADLs allows conclusions about physical and cognitive status, provides information about frailty, and allows predictions about risk of falling.

    “The measurement of ADLs allows conclusions to be drawn about the physical and cognitive status, provides information about frailty, and allows predictions about the risk of falling ( (Nourhashemi et al. 2001), (Hellström et al. 2013), (Tinetti et al. 1994)).”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites Nourhashemi et al. 2001

      Not checked in the free run.

    • cites Hellström et al. 2013 source

      Not checked in the free run.

    • cites Tinetti et al. 1994

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    ADLs are typically the first activities that require outside support, with hygiene being an early-loss activity, toilet-use a mid-loss activity, and eating a late-loss activity.

    “These activities are typically the first ones that require outside support and it has been found that there is a progressive functional loss on them, with hygiene being an early-loss activity (i.e., this is one of the first ADL where it is likely that a person needs help from others), toilet-use a mid-loss activity, and eating a late-loss activity (Morris et al. 2013).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Morris et al. 2013 source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S2 (checkable), S4 (based). May combine two claims.

    Interpretationnone given

    Monitoring ADLs would allow estimation of independency in daily living of older adults and recommendation of activities that might improve a patient's health status.

    “Monitoring ADLs would allow to estimate the independency in their daily living of older adults, as well as to recommend activities that might improve a patient's health status.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Human activities can be decomposed into four hierarchical levels: high-level activities, mid-level activities, low-level activities, and modes of locomotion.

    “According to (Roggen et al. 2010), we have decomposed human activities into four hierarchical levels:”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Roggen et al. 2010 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Modes of locomotion can be used as reference for physical activity level and are useful for detecting hazardous situations such as falling.

    “Additionally, modes of locomotion like walking, sitting and lying can be used as reference for the physical activity level of an individual.Furthermore, they can be useful for detecting hazardous situations such as falling (Ni et al. 2015).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Ni et al. 2015

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Micro-mobility and nutrition status are important indicators to estimate the risk profile for decubitus, especially in elder patients, and the ability to change position in bed is essential to avoid it.

    “Micro-mobility (movements in bed) and nutrition status are important indicators to estimate the risk profile for decubitus, especially in elder patients.These patients constitute the single largest group (more than 60%) among all patients with decubitus ulcers (Anders et al. 2010) and their ability to change the position in bed is essential to avoid it (Harris 1996).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites Anders et al. 2010 source

      Not checked in the free run.

    • cites Harris 1996 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Getting out of the bed unsupervised may lead to falls, which are a major problem in hospitals and contribute to substantial healthcare burden.

    “Getting out of the bed unsupervised may lead to falls being a major problem in hospitals and contribute to substantial healthcare burden, e. g., a significant injury or an increased length of stay (( Oliver et al. 2004), (Oliver et al. 2010)).”
    Quote in the paperSubstantial claim0 of 2 sources checked
    • cites Oliver et al. 2004 source

      Not checked in the free run.

    • cites Oliver et al. 2010 source

      Not checked in the free run.

  • Classified as probably not a substantial claim.

    Interpretationreasoning

    For timely prevention of decubitus, it is necessary to monitor mobility and nutrition intake and detect any change indicating a risk increase.

    “For timely prevention it is necessary to monitor mobility and nutrition intake and detect any change indicating a risk increase for decubitus.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Using the toilet is clinically important because incontinence is one of the most common symptoms in neurological rehabilitation and has considerable physical, psychological and social consequences that can significantly impair quality of life.

    “The activity “Using the toilet” is clinically important, because incontinence is one of the most common symptoms in neurological rehabilitation and has considerable physical, psychological and social consequences, which can significantly impair the quality of life of affected patients (Irwin et al. 2006).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Irwin et al. 2006 source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S2 (checkable).

    Interpretationcitation

    It is important to monitor the drinking habits of persons with enhanced risk of dehydration.

    “Therefore, it is important to monitor the drinking habits of persons with enhanced risk of dehydration (Shells and Morrell-Scott 2018).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Shells and Morrell-Scott 2018 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Malnutrition in elderly patients undergoing rehabilitation is a prevalent and often neglected problem associated with lower rehabilitation effect and lower physical function.

    “Malnutrition in elderly patients undergoing rehabilitation is a prevalent and often neglected problem associated with lower rehabilitation effect and lower physical function (Pirlich et al. 2006).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Pirlich et al. 2006 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Elder neurological patients often show decreased thirst, which leads to dehydration and exsiccosis.

    “Especially elder neurological patients often show decreased thirst, which leads to dehydration and exsiccosis (Lauster and Mertl-Rötzer 2014).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Lauster and Mertl-Rötzer 2014

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    The activPAL micro is used quite often in clinical, older aged residents and hospital trials.

    “It is used quite often in clinical, older aged residents and hospital trials (Chan et al. 2017).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Chan et al. 2017

      Not checked in the free run.

  • May combine two claims.

    Study design and conductreasoning

    The synchronization gesture generated clearly visible impacts on the data records of all sensors, enabling synchronization of the time axes of sensor records with camera records.

    “This gestures generated clearly visible impacts on the data records of all sensors, and thus enabled to syncronise later the time axes of the sensor records with the camera records.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Reducing the sampling frequency of SmartCardia and Myo armbands to 20 Hz is not problematic because a study found no significant gain in accuracy when using accelerometer sampling frequencies above 20 Hz.

    “The reduction of the sampling frequency (and hence of the available data) for these sensors is not problematic, as Maurer et al. (2006) studied the behavior of the accuracy of models (based on accelerometer sensor data) as a function of the accelerometer sampling rate.In this study, the sampling rate was varied from 1 to 30 Hz and no significant gain in accuracy was found when using sampling frequ”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Maurer et al. (2006)

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S2 (checkable).

    Interpretationreasoning

    It is important to recognize changes in dietary habits for timely intervention, i.e. before weight and muscle loss occur.

    “In addition to monitoring the patient's weight, it is important to recognize changes in dietary habits for timely intervention, i.e. before weight and muscle loss occur.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisereasoning

    Only one Bluetooth connection can be established on a device, so two computers are necessary for capturing the data of two Myo armbands.

    “Since only one Bluetooth connection can be established on a device, two computers are necessary for capturing the data of two Myo armbands.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    All assistants needed for the data acquisition signed a data privacy statement.

    “All assistants needed for the data acquisition also signed a data privacy statement.”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim.

    Study design and conductnone given

    The activity protocol and other study-related documents were reviewed by the Ethics Committee of the Bavarian State Medical Association, Munich.

    “The activity protocol and other study related documents were reviewed by the Ethics Committee of the Bavarian State Medical Association, Munich.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Study design and conductreasoning

    All legal requirements have been fulfilled, including insurance, qualification of study personnel, certification of sensor equipment, data protection, and a positive risk-benefit profile.

    “All legal requirements have been fulfilled, i.e. the insurance, qualification of study personnel, certification of sensor equipment, data protection and a positive risk-benefit profile.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    At no time will there be diagnostic or medical statements or therapy adaptations based on the data acquisition trials or data analysis.

    “It was also stated that at no time will there be diagnostic or medical statements or therapy adaptations based on the data acquisition trials or data analysis.”
    Quote in the paperNot a substantial claim
  • Classified as probably not a substantial claim.

    Study design and conductcitation

    The physical and cognitive status of each participant was tested using the 5x sit-to-stand-test (5XSST), grip force test, and Montreal Cognitive Assessment (MoCA).

    “In addition, the physical and cognitive status of each participant was tested.A functional test for the general fitness and frailty (5x sit-to-stand-test (5XSST), (Treacy and Hassett 2018)), the grip force test (Allen and Barnett 2011) and a test to measure the cognitive status of the participants (Montreal Cognitive Assessment (MoCA), (Nasreddine et al. 2005)) were examined.”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites Treacy and Hassett 2018 source

      Not checked in the free run.

    • cites Allen and Barnett 2011 source

      Not checked in the free run.

    • cites Nasreddine et al. 2005 source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    Participants were explicitly informed about their rights according to the General Data Protection Regulation (GDPR).

    “The participants where explicitly informed about their rights according to the General Data Protection Regulation (GDPR).”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Interpretationreasoning

    Two technical assistants and two (medical) assistants are needed to manage the equipment and guide participants through the session according to the activity protocol.

    “To optimize these procedures, two technical assistants are needed to manage the equipment as well as two (medical) assistants to prepare the participants and to guide them through the session according to the activity protocol.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Study design and conductnone given

    All participants signed a written consent and a data protection form, proved by the local ethical commission in accordance with the Declaration of Helsinki, and gave permission to use their video material for data annotation.

    “Before participating in the study, all participants signed a written consent and a data protection form, proved by the local ethical commission in accordance with the Declaration of Helsinki and gave permission to the use of their video material for data annotation.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    Elderly persons are considered vulnerable, so conceptual adjustments were made to address aspects of vulnerability.

    “In general, elderly persons are considered as vulnerable and therefore conceptual adjustments had to be made to address the different aspects of vulnerability (Schroder-Butterfill and Marianti 2006).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Schroder-Butterfill and Marianti 2006 source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductreasoning

    The activity protocol was held flexible to allow adaptation of procedures to the abilities of the participants.

    “Thus, the activity protocol was held flexible to allow the adaptation of procedures to the abilities of the participants (respecting cognitive, mental, and physical limitations).”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductreasoning

    The medical assistants were actively attentive in order to adapt the activities, interrupt or terminate the participation.

    “The medical assistants were actively attentive in order to adapt the activities, interrupt or terminate the participation.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Study design and conductnone given

    If necessary, participants were supported by a physical therapist throughout the entire session for safety.

    “If necessary, the participants were supported by a physical therapist throughout the entire session for safety.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Ward et al. (2011) developed specialized metrics to measure the performance of a HAR classifier, defined as frame analysis and event analysis.

    “Ward et al. (2011) developed specialized metrics to measure the performance of a HAR classifier, defined as frame analysis and event analysis.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Ward et al. (2011) source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Statistical features (e.g., mean, variance, kurtosis and interquartile range) are popular for HAR problems due to their simplicity as well as their performance.

    “A set of features is then calculated for each window: statistical features, e.g., mean, variance, kurtosis and interquartile range, are popular for HAR problems due to their simplicity as well as their performance (Bulling et al. 2014).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Bulling et al. 2014 source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    These analyses extend the traditional classification errors (false positives and false negatives) onto more descriptive categories: deletion, insertion, merge, and fragmentation.

    “These analyses extend the traditional classification errors (false positives and false negatives) onto more descriptive categories: deletion, insertion, merge, and fragmentation.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Ward et al. (2011) source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Frame analysis corresponds to error categories calculated with regard to the single frames (time windows) of the classifier.

    “Frame analysis corresponds to error categories that can be calculated with regard to the single frames (time windows) of the classifier.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Ward et al. (2011) source

      Not checked in the free run.

  • Classified as probably not a substantial claim.

    Premisecitation

    An event is equivalent to a sequence of windows that represent the same activity.

    “In contrast, an event is equivalent to a sequence of windows that represent the same activity.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Ward et al. (2011) source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    The authors of the Opportunity dataset released a public challenge to recognize hand gestures and locomotion activities.

    “The authors of the dataset released a public challenge to recognize hand gestures and locomotion activities.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Chavarriaga et al. 2013 source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S4 (based).

    Interpretationreasoning

    Critical situations (e.g., fall, immobility or dehydration) could then be recognised both for patients in the hospital and for elderly people at home, such that care staff could intervene earlier.

    “Critical situations (e.g., fall, immobility or dehydration) could then be recognised both for patients in the hospital and for elderly people at home, such that care staff could intervene earlier.”
    Quote in the paperNot a substantial claim
    • Rests on an assumption: The HAR system can reliably recognize critical situations such as falls, immobility, or dehydration.
  • Classified as probably not a substantial claim.

    Interpretationreasoning

    The analysis of activity pattern and possible pattern deviations allows risk assessments without the affected person being permanently observed and without intrusion into the persons' privacy.

    “The analysis of activity pattern and possible pattern deviations allows therefore risk assessments without the affected person being permanently observed and without intrusion into the persons' privacy.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: Using unobtrusive sensor-systems does not intrude into the persons' privacy.
  • Classified as probably not a substantial claim. May combine two claims.

    Premisenone given

    The TA-EG is a 19-item questionnaire consisting of four dimensions: enthusiasm for technology, competence in dealing with technology, positive and negative attitudes towards technology.

    “The TA-EG is a 19-item questionnaire consisting of four dimensions, i.e., enthusiasm for technology, competence in dealing with technology, positive and negative attitudes towards technology.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    The TA-EG is one of a few scales that is not restricted to computer use.

    “Therefore, the Affinity for Technology questionnaire (TA-EG) of electrical devices was used, which is one of a few scales that is not restricted to computer use ( (Karrer et al. 2009), (Attig et al. 2017)).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites Karrer et al. 2009

      Not checked in the free run.

    • cites Attig et al. 2017

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S4 (based). May combine two claims.

    Interpretationreasoning

    By using unobtrusive sensor-systems in the respective room, the assistance of professional caregivers could be reduced and therefore lead to a more private environment.

    “By using unobtrusive sensor-systems in the respective room, the assistance of professional caregivers could be reduced and therefore lead to a more private environment.”
    Quote in the paperNot a substantial claim
    • Rests on an assumption: The proposed HAR system can enhance quality of life, privacy, and autonomy and reduce carer effort.
  • Probably not a substantial claim: may not pass S3 (load-bearing). The quote only partly states this claim.

    Premiseown data

    The responses to all TA-EG items are categorized on a 5-point Likert scale, ranging from 'fully agree' to 'fully disagree'.

    “The responses to all items are categorized on a 5-point Likert scale, ranging from”
    Quote in the paperNot a substantial claim
72 of 72
  • The paper relies on this without support.

    Healthy people move much faster and safer than elderly or diseased people, and the type of disease also affects movements.

    “This approach is challenging, since healthy people move much faster and safer compared to elderly or diseased people.Furthermore, the type of disease also affects the movements.”
  • The paper relies on this without support.

    The endurance of participants is not as high as it is with healthy persons.

    “Another challenging aspect during data recording is that the endurance of the participants is not as high as it is with healthy persons.”
  • The paper relies on this without support.

    There is no common definition or description of human activities that explains how a specific activity is characterized.

    “First of all, there is no common definition or description of human activities that explains how a specific activity is characterized.”
  • The paper relies on this without support.

    Sensor position has a significant effect on the signal quality for distinct types of movement.

    “We used nine identical activPAL monitors, two Myo armbands and one SmartCardia wearable to record motion information in separate body partitions since the sensor position has a significant effect on the signal quality for distinct types of movement (e.g.walking or drinking).”
  • The paper relies on this without support.

    In hospitals, a vast amount of caregiver time is used to support the patient to use the toilet.

    “Moreover, in the hospitals a vast amount of caregiver time is used to support the patient to use the toilet.”
  • The paper relies on this without support.

    The activities retained in the activity protocol are clinically relevant for elderly people and patients.

    “In order to adapt the protocol to the lower resilience of elderly people and patients, we removed the leisure activities (smartphone interaction and writing) from the activity protocol because they have no clinical relevance either.”
  • The paper relies on this without support.

    The proposed HAR system can enhance quality of life, privacy, and autonomy and reduce carer effort.

    “The data acquisition and the proposed HAR system aim to enhance the quality of life, privacy, and autonomy of elderly people as well as patients in addition with a reduction of carer effort.”
  • The paper relies on this without support.

    The HAR system can reliably recognize critical situations such as falls, immobility, or dehydration.

    “Critical situations (e.g., fall, immobility or dehydration) could then be recognised both for patients in the hospital and for elderly people at home, such that care staff could intervene earlier.”
  • The paper relies on this without support.

    Using unobtrusive sensor-systems does not intrude into the persons' privacy.

    “without intrusion into the persons' privacy.”
9 of 9

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Automatic human activity recognition is an essential element in developing human-interaction applications in personal fitness and healthcare.

    “Automatic human activity recognition is an essential element in developing human-interaction applications in personal fitness and healthcare [14].”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • Canon camera classified as wearable despite cameras being ambient sensors

    Minor

    The text classifies cameras as ambient sensors, but Table 1 classifies the Canon G11 camera as a wearable device.

  • Pressure-mat dimensions use conflicting units

    Minor

    The BPMS sensor layer is described as 940 × 640 mm2 in the text, but Table 1 gives 940 × 640 cm2. Those units describe areas differing by a factor of 100.

2 of 2

Cites

Flagged first, then by citations

Research works printed but not linked: 2

  1. Vargas Toro, A. (2018). Recognition of multi-level human activities by implementing an "activity recognition chain" in a benchmark dataset. Bachelor Thesis: Fraunhofer IAIS, Universidad EAFIT https://github.com/Fustincho/bachelor-thesis.
  2. Yang, A. Y., Kuryloski, P. & Bajcsy, R. (2009). WARD : A wearable action recognition database. CHI Conference on Human Factors in Computing Systems.

Cited by

Sorted by citations

Authors
Schrader, L., Vargas Toro, A., Konietzny, S., Rüping, S., Schäpers, B., Steinböck, M., Krewer, C., Müller, F., Güttler, J., & Bock, T.
Affiliations
  • Fraunhofer Institute for Intelligent Analysis and Information Systems (DE)
  • Schön Klinik Bad Aibling (DE)
  • Technical University of Munich (DE)
Corresponding author
Schrader, Lisa
Venue
Journal of Population Ageing
Published
2020-02-24
Volume
13
Issue
2
Pages
139-165
ISSN
  • 1874-7876 (ISSN-L)
  • 1874-7884
OpenAlex
W3007383329
Cited by
110
References
40
Citations by year
2026: 15 · 2025: 17 · 2024: 16 · 2023: 27 · 2022: 23 · 2021: 9 · 2020: 3
FWCI
6.03
Type
journal article
Language
en
Open access
Locations
  • Journal of Population Ageing (publishedVersion, cc-by)
  • Fraunhofer-Publica (Fraunhofer-Gesellschaft) (submittedVersion, cc-by)
  • Publikationsdatenbank der Fraunhofer-Gesellschaft (Fraunhofer-Gesellschaft) (submittedVersion, other-oa)
  • mediaTUM (Technical University of Munich) (submittedVersion, cc-by)
Funders
Horizon 2020 Framework Programme (690425)
Topics
  • Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Context-Aware Activity Recognition Systems
  • Social Sciences › Demography › Technology Use by Older Adults
  • Health Sciences › Medicine › Physiology › Physical Activity and Health
Keywords
human activity recognition, older adults, rehabilitation, early intervention, wearable sensors, ambient sensors, activity monitoring, activities of daily living, lying posture, hospital data collection, sensor data recording

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-09.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-09.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review