CoChat
Sign Up
Cited by 125Physical Activity and HealthObesity, Physical Activity, DietContext-Aware Activity Recognition Systems

The DOI matches its Crossref record; 27 of the 27 references it cites were found in a registry or an index.

Intraindividual Variation of Objectively Measured Physical Activity in Children

MATTOCKS, CALUM, LEARY, SAM, NESS, ANDY, DEERE, KEVIN, SAUNDERS, JOANNE, KIRKBY, JOANNE, BLAIR, STEVEN N., TILLING, KATE, RIDDOCH, CHRIS·2007·Medicine & Science in Sports & Exercise
DOI 10.1249/mss.0b013e318030631b
Open this paper in CoChat — free account

Abstract

PURPOSE: This study examined the seasonal and intraindividual variation in objectively measured physical activity in 11- to 12-yr-olds. METHODS: Children were asked to wear a uniaxial accelerometer for 7 d four times throughout the course of about a year. A random-intercepts model was used to separate the inter- and intraindividual components of physical activity. Gender, age, body mass index (BMI), height, and month of measurement were fitted to the model as potential confounders. RESULTS: A total of 315 children had valid data for at least two measurement occasions, and 244 had data for all four measurement occasions. The unadjusted intraclass correlation coefficient (ICC) for total activity (counts per minute) was 0.54; 0.49 after adjusting for gender, age, and BMI; and 0.53 after adjusting for gender, age, BMI, and month. Further adjustment for pubertal status at baseline had no effect on the ICC. Restricting the analysis to only those with data for all four measurement occasions (N=244), or to measurements taken on school days only, had no effect on the ICC. The fully adjusted ICC was 0.51 for weekdays only and 0.39 for weekend days only. For minutes of moderate to vigorous physical activity, minutes of vigorous activity, minutes of sedentary behavior, and number of 30-min blocks of sedentary behavior, the fully adjusted ICC were 0.45, 0.37, 0.59, and 0.39, respectively. The analysis was repeated for boys and girls separately, but the differences in ICC were small. CONCLUSION: There was substantial intraindividual variation in the objectively measured physical activity of these children. Studies using single a measurement occasion where physical activity is the exposure should take this into account to adjust for regression dilution.

Overview

Integrity signals

Registry

Crossref · 10.1249/mss.0b013e318030631b

Cites

27 of 27 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Verification

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

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?

Citations

Cites

Cited by

Sorted by citations

See all 125

Related

See all

Metadata

Authors
MATTOCKS, C., LEARY, S., NESS, A., DEERE, K., SAUNDERS, J., KIRKBY, J., BLAIR, S. N., TILLING, K., & RIDDOCH, C.
Affiliations
  • University of Bristol (GB)
  • University of Glasgow (GB)
  • University of South Carolina (US)
  • University of Bath (GB)
ORCID
Venue
Medicine & Science in Sports & Exercise
Publisher
Ovid Technologies (Wolters Kluwer Health)
Published
2007-04
Volume
39
Issue
4
Pages
622-629
ISSN
0195-9131 (ISSN-L)
DOI
10.1249/mss.0b013e318030631b
OpenAlex
W2067717559
Cited by
125
References
27
Citations by year
2023: 1 · 2022: 7 · 2021: 3 · 2020: 4 · 2019: 5 · 2018: 7 · 2017: 8 · 2016: 6 · 2015: 5 · 2014: 8 · 2013: 13 · 2012: 11
FWCI
7.83
Type
journal article
Language
en
Open access
closed
Locations
  • Medicine & Science in Sports & Exercise (publishedVersion)
  • PubMed (publishedVersion)
  • Explore Bristol Research (publishedVersion)
  • Bristol Research (University of Bristol) (submittedVersion)
Funders
  • Wellcome Trust
  • National Heart, Lung, and Blood Institute (R01 HL071248-01A, R01HL071248)
Topics
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Physical Activity and Health
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Obesity, Physical Activity, Diet
  • Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Context-Aware Activity Recognition Systems
Keywords
within-person variability, physical activity, children, accelerometer-measured activity, intraclass correlation coefficient, seasonal variation, regression dilution, sedentary behavior, moderate-to-vigorous physical activity, measurement reliability, pubertal stage
MeSH terms
Child, Data Collection, Female, United Kingdom, Humans, Male, Seasons, Reproducibility of Results, Exercise, Monitoring, Ambulatory

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.

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