The DOI matches its Crossref record; 40 of the 40 references it cites were found in a registry or an index; 3 of the 16 sources its claims cite were checked for support.
DeepHeart: Semi-Supervised Sequence Learning for Cardiovascular Risk Prediction
Open accessAbstract
We train and validate a semi-supervised, multi-task LSTM on 57,675 person-weeks of data from off-the-shelf wearable heart rate sensors, showing high accuracy at detecting multiple medical conditions, including diabetes (0.8451), high cholesterol (0.7441), high blood pressure (0.8086), and sleep apnea (0.8298). We compare two semi-supervised training methods, semi-supervised sequence learning and heuristic pretraining, and show they outperform hand-engineered biomarkers from the medical literature. We believe our work suggests a new approach to patient risk stratification based on cardiovascular risk scores derived from popular wearables such as Fitbit, Apple Watch, or Android Wear.
Overview
AI snapshot
Written from the paper’s full text.
TL;DR
DeepHeart trains a semi-supervised, multi-task LSTM on wearable heart-rate and step-count data from 14,011 participants, detecting diabetes, high cholesterol, high blood pressure, and sleep apnea with c-statistics up to 0.8451. Semi-supervised sequence learning and heuristic pretraining outperform hand-engineered biomarker baselines, though the paper notes confounding, deployment, interpretability, and data-scale challenges.
Key findings
- On 57,675 person-weeks, semi-supervised sequence pretraining achieved c-statistics of 0.7441 for high cholesterol, 0.8086 for high blood pressure, and 0.8298 for sleep apnea; the abstract reports diabetes at 0.8451, while Table 2 lists 0.8451 for the no-pretraining LSTM and 0.7998 for unsupervised pretraining.
- The LSTM without pretraining outperformed baselines on sleep apnea (0.80 vs 0.55–0.66), hypertension (0.80 vs 0.61–0.72), high cholesterol (0.67 vs 0.43–0.60), and diabetes (0.85 vs 0.41–0.79).
- Heuristic pretraining improved high cholesterol (0.71 vs 0.67) but significantly hurt high blood pressure (0.74 vs 0.80); semi-supervised sequence learning improved high cholesterol, high blood pressure, and sleep apnea.
- For hypertension and sleep apnea, unsupervised pretraining yielded a 10x improvement in data-efficiency: nearly the same accuracy with 10% of labeled data as with 100% and no pretraining.
Methods
- Recruited 14,011 Apple Watch app users in partnership with the UCSF Health eHeart Study, collecting 200 million unlabeled sensor measurements; after filtering, 57,675 person-weeks were split into 33,628 training, 18,555 tuning, and 12,790 validation weeks, with disjoint participants across sets.
- Model inputs were multi-channel, multi-timescale tensors for heart rate, step count, and time deltas; architecture used 3 temporal convolution layers followed by 4 bidirectional LSTM layers, with multi-task outputs for high cholesterol, hypertension, sleep apnea, diabetes, and ECG.
- Compared supervised LSTM, heuristic pretraining on heart-rate-variability metrics at 5-second, 30-second, 5-minute, and 30-minute windows, and semi-supervised sequence autoencoder pretraining; baselines used 13 hand-engineered biomarkers and standard ML algorithms, evaluated by c-statistic/AUC on the test set.
Limitations
- The paper states challenges including confounding (e.g., beta blockers affecting heart rate variability), deployment barriers, lack of interpretability in deep learning, and difficulty modeling long time-scale and high-volume data.
- The paper notes high cholesterol has the least direct physiological relationship with heart rate variability and may reflect confounders such as age, sex, or medications; diabetes has scarce labels (1,678 person-weeks).
- Evident from the text: consumer sensors have significant error and variable measurement rates, ambulatory activities like walking, exercise, stress, alcohol, or coffee may confuse simple heuristics, and the results are predictive rather than causal.
Model-written summary. Check it against the paper before relying on it.
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Claims the paper makes
3 of 16 cited sources checked · 2 supported · 0 flagged · accuracy not yet measured
Every source the paper cites for this claim was checked and supports it.
In the paper
“Semi-supervised sequence learning has been shown to improve performance when presented with large amounts of unlabeled training data (Dai and Le 2015).”
What the sources say
- Supportedcites Dai and Le 2015 source
The Introduction (p. 1) says that using more unlabeled data in pretraining can improve a subsequent supervised model, citing a Rotten Tomatoes accuracy increase from 79.7% to 83.3%. Section 4.2 (p. 5) also reports lower error when the sequence autoencoder was pretrained on a larger unlabeled dataset. (LLM, conf=0.94)
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes- Supported
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“We compare two semi-supervised training methods, semi-supervised sequence learning and heuristic pretraining, and show they outperform hand-engineered biomarkers from the medical literature.”
- Also stated in: § Introduction · p. 1 · plain
“Then we present experimental results showing that semisupervised deep neural networks achieve higher accuracy in detecting diabetes, sleep apnea, high blood pressure, and high cholesterol than several strong baselines derived from biomarkers in the medical literature.”
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes- Also stated in: § Introduction · p. 1 · plain
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“We train and validate a semi-supervised, multi-task LSTM on 57,675 person-weeks of data from off-the-shelf wearable heart rate sensors, showing high accuracy at detecting multiple medical conditions, including diabetes (0.8451), high cholesterol (0.7441), high blood pressure (0.8086), and sleep apnea (0.8298).”
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“When the supervised LSTM is initialized with weights from heuristic pretraining, we saw noticeable improvements for high cholesterol (0.71 vs 0.67), neutral results for sleep apnea and diabetes, and a significant loss for high blood pressure (0.74 vs 0.80).”
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Furthermore, we've shown high accuracy at detecting four common health conditions-diabetes, sleep apnea, hypertension, and high cholesterol-using readily available, off-the-shelf heart rate monitors.”
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“When the supervised LSTM is initialized with weights from heuristic pretraining, we saw noticeable improvements for high cholesterol (0.71 vs 0.67), neutral results for sleep apnea and diabetes, and a significant loss for high blood pressure (0.74 vs 0.80).”
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesThe paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“For diabetes and cholesterol, the effect is muted.”
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“We first trained a purely-supervised LSTM without pretraining, which performed significantly better than the baselines on sleep apnea (0.80 vs 0.55-0.66), hypertension (0.80 vs 0.61-0.72), high cholesterol (0.67 vs 0.43-0.60), and diabetes (0.85 vs 0.41-0.79).”
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“We first trained a purely-supervised LSTM without pretraining, which performed significantly better than the baselines on sleep apnea (0.80 vs 0.55-0.66), hypertension (0.80 vs 0.61-0.72), high cholesterol (0.67 vs 0.43-0.60), and diabetes (0.85 vs 0.41-0.79).”
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“We train and validate a semi-supervised, multi-task LSTM on 57,675 person-weeks of data from off-the-shelf wearable heart rate sensors, showing high accuracy at detecting multiple medical conditions, including diabetes (0.8451), high cholesterol (0.7441), high blood pressure (0.8086), and sleep apnea (0.8298).”
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
- Probably not a substantial claim. 10
- It may state two separate claims as one. 12
Every source the paper cites for this claim was checked and supports it.
In the paper
“Previous work has applied statistical methods on beat-tobeat variability to detect heart arrhythmias (McManus et al. 2013).”
What the sources say
- Supportedcites McManus et al. 2013 source
The Methods (Approaches to Pulse Waveform Analysis) describe using two statistical techniques on beat-to-beat RR-interval variability to detect an irregular pulse associated with atrial fibrillation. The Discussion reports that the combined application distinguished pulses during AF from those during normal sinus rhythm. (LLM, conf=0.94)
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
- Supported
The cited sources support only part of this claim — read each source’s verdict below.
In the paper
“Deep neural networks (LeCun, Bengio, and Hinton 2015) have shown high accuracy at pattern recognition from noisy, complex inputs, including automated detection of diabetic retinopathy from images (Gulshan et al. 2016), skin cancer from mobile phone cameras (Esteva et al. 2017), and the onset of health conditions from electronic medical records (Razavian, Marcus, and Sontag 2016; Lipton et al. 2015”
What the sources say
- Not checked — no full text of the sourcecites LeCun, Bengio, and Hinton 2015 source
- Not checked — no full text of the sourcecites Gulshan et al. 2016 source
- Partly supportedcites Esteva et al. 2017 sourceExperimental — accuracy not yet measured
Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.
Strength:plain· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“This approach resulted in a significant improvement on high cholesterol, high blood pressure, and sleep apnea.”
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“While we are able to detect high cholesterol with c-statistic of 0.74, it is the lowest performing prediction out of the four disease states, suggesting that much of the correlation may be a reflection of confounding variables such as age, sex, or usage of medications like beta blockers.”
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“After filtering, there were 57,675 person-weeks of data in total, divided into 33,628 for training, 18,555 for tuning, and 12,790 for validation.”
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“For hypertension and sleep apnea, unsupervised pretraining yields a 10x improvement in data-efficiency: the DNN achieves nearly the same accuracy with 10% of labeled data using unsupervised pretraining as it does with 100% of labeled data using no pretraining.”
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“A model using only aggregate step counts achieved an AUC of 0.7011 (diabetes), 0.5811 (sleep apnea), 0.5714 (hbp), and 0.5601 (high cholesterol), suggesting that although overall physical activity plays an important role in predicting the onset of disease, the heart's response to physical activity is a more salient biomarker that can be captured using deep learning.”
Load-bearingStrength:hedged· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
In the paper
“Previous work from the medical community has suggested that diabetes may impact heart rate variability through effects on the autonomic nervous system (Kudat et al. 2006).”
What the sources say
- Not checked — no full text of the sourcecites Kudat et al. 2006 source
Strength:hedged· not yet calibratedCausal:conditional· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“Each participant was randomly assigned to either the training, tuning, or testing set.”
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“We've shown that two methods, semi-supervised sequence learning and heuristic pretraining, address a key technical challenge in applying deep learning to medicine: achieving high accuracy with limited labeled data.”
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
In the paper
“Sleep apnea is estimated to affect 22 million people in the US alone, over 80% of whom are undiagnosed (Young et al. 1997).”
What the sources say
- Not checked — no full text of the sourcecites Young et al. 1997 source
Strength:hedged· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
In the paper
“Together, high blood pressure and high cholesterol account for 17.3% of global deaths (Alwan and others 2011), as they are both major risk factors for heart attacks.”
What the sources say
- Not matchedcites Alwan and others 2011
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
Strength:plain· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
- Not matched
In the paper
“45.8% of diabetes cases are undiagnosed (Beagley et al. 2014).”
What the sources say
- Not checked — no full text of the sourcecites Beagley et al. 2014 source
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“A model using only aggregate step counts achieved an AUC of 0.7011 (diabetes), 0.5811 (sleep apnea), 0.5714 (hbp), and 0.5601 (high cholesterol), suggesting that although overall physical activity plays an important role in predicting the onset of disease, the heart's response to physical activity is a more salient biomarker that can be captured using deep learning.”
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
In the paper
“including rich signals like resting heart rate and heart rate variability, which have been shown to correlate with health conditions as diverse as diabetes, sleep apnea, atrial fibrillation, heart failure, sudden cardiac death, and irritable bowel syndrome (Kamath, Watanabe, and Upton 2012).”
What the sources say
- Not matchedcites Kamath, Watanabe, and Upton 2012
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
- Not matched
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“This suggests wearables could be used to focus diagnostic testing on a high-risk subset of the population, leading to cost-effective screening for metabolic syndrome and getting at-risk patients care sooner.”
Tests✓ Asserted: passes✗ Checkable: fails✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim. It may be too vague to check against evidence. It may state two separate claims as one.
In the paper
“Since these four conditions are highly prevalent, commonly undiagnosed, and reduced HRV is associated with the earliest stages of disease progression (Schroeder et al. 2005; 2003), this suggests a new approach to public health screening using deep learning.”
What the sources say
- Not matchedcites Schroeder et al. 2005; 2003
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
Tests✓ Asserted: passes✗ Checkable: fails✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim. It may be too vague to check against evidence. It may state two separate claims as one.
- Not matched
In the paper
“Statistical models in medicine are typically used for etiology, not just prediction, and cause (disease) and effect (treatment) may be intertwined in subtle ways within medical data sets (Shmueli and others 2010).”
What the sources say
- Not matchedcites Shmueli and others 2010
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim. It may state two separate claims as one.
- Not matched
The paper relies on this without support.
No such database exists for wearable data.
“No such database exists for wearable data, and in most hospital systems, recruiting even a hundred patients into a new medical study is labor-intensive and expensive.”
The paper relies on this without support.
Recruiting even a hundred patients into a new medical study is labor-intensive and expensive.
“No such database exists for wearable data, and in most hospital systems, recruiting even a hundred patients into a new medical study is labor-intensive and expensive.”
The paper relies on this without support.
High cholesterol has the least direct physiological relationship with heart rate variability in the medical literature.
“Among all four health conditions, high cholesterol has the least direct physiological relationship with heart rate variability in the medical literature.”
The paper relies on this without support.
Purely supervised deep learning requires many labeled examples.
“However, purely supervised deep learning requires many labeled examples.”
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?
In the citing paper
“Recent advances in deep learning architectures for sequential modelling based upon wearable and mobile sensing have been used for health predictions and recommendations [141].”
From Human-centred artificial intelligence for mobile health sensing: challenges and opportunities (2023) · cites this paper as [141]
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.
Data-set split counts exceed the stated total
MajorThe reported training, tuning, and validation counts sum to 64,973 person-weeks, not the stated total of 57,675.
Reported 57675 · recomputed 64973
“After filtering, there were 57,675 person-weeks of data in total, divided into 33,628 for training, 18,555 for tuning, and 12,790 for validation.”
Conflicting results for heart-rate-only prediction of high blood pressure
MinorThe same passage says the heart-rate-only model performed significantly worse on high blood pressure and also performed the same within the 95% confidence interval.
“A model trained only on heart rate timeseries performed significantly worse on diabetes and high blood pressure (decrease of 0.0653 and 0.0721 in AUC, respectively)”
“and the same on sleep apnea and high blood pressure (within the 95% confidence interval)”
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Automated Heart Arrhythmia Detection from Electrocardiographic Data
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A Multi-Layered LSTM for Predicting Physician Stress During an ED ShiftPreprint
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Technology and Aging: Ubiquitous Sensing Technology for Aging Research
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Your Pedometer Tells You: Attribute Inference via Daily Walking Step Count
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Learning Sensory Representations with Minimal Supervision
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Metadata
- Authors
- Ballinger, B., Hsieh, J., Singh, A., Sohoni, N., Wang, J., Tison, G., Marcus, G., Sanchez, J., Maguire, C., Olgin, J., & Pletcher, M.
- Affiliations
- Stanford Medicine (US)
- University of California, San Francisco (US)
- Venue
- Proceedings of the AAAI Conference on Artificial Intelligence
- Published
- 2018-04-26
- Volume
- 32
- Issue
- 1
- Pages
- 2079-2086
- ISSN
- 2159-5399 (ISSN-L)
- 2374-3468
- OpenAlex
- W2785925437
- Cited by
- 156
- References
- 40
- Citations by year
- 2026: 10 · 2025: 10 · 2024: 9 · 2023: 23 · 2022: 18 · 2021: 28 · 2020: 27 · 2019: 23 · 2018: 8
- FWCI
- 20.75
- Type
- conference paper
- Language
- en
- Open access
- diamond
- doi.org
- Locations
- Proceedings of the AAAI Conference on Artificial Intelligence (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- eScholarship (California Digital Library) (submittedVersion)
- AAAI Publications (The Association for the Advancement of Artificial Intelligence (AAAI)) (submittedVersion)
- arXiv (Cornell University)
- Topics
- Health Sciences › Health Professions › Health Information Management › Artificial Intelligence in Healthcare
- Physical Sciences › Engineering › Biomedical Engineering › Non-Invasive Vital Sign Monitoring
- Physical Sciences › Computer Science › Artificial Intelligence › Machine Learning in Healthcare
- Keywords
- cardiovascular risk prediction, semi-supervised learning, sequence learning, LSTM, wearable heart rate sensors, diabetes detection, hypercholesterolemia, hypertension, sleep apnea, multi-task learning, risk stratification, pre-training
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.
A language model drew the claims from the paper on 2026-10-09, under version 3 of the claim definition (model deepseek-v4.1-flash, prompt extract-v3).
A second model labelled each claim on 2026-10-09 (model jev-1.13-20260917, definition revision gold-guideline-v0.2).
Cited sources are checked with a language model’s help (gpt-6-sol).
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 ›
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