ArticleThe international journal of behavioral nutrition and physical activity2014
Combined influence of epoch length, cut-point and bout duration on accelerometry-derived physical activity.
Article in The international journal of behavioral nutrition and physical activity, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 51 papers, 5 of them syntheses that pooled it.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
51 citing papers in PubMed, 5 syntheses or guidelines pooled it.
- Synthesis and Validity of Accelerometer Devices and Methods Used in Epidemiological Studies of Physical Activity Bout Duration and Health Outcomes: A Systematic Review.Sports medicine - open · 2026Pooled it
- Genetic variants related to physical activity or sedentary behaviour: a systematic review.The international journal of behavioral nutrition and physical activity · 2021Pooled it
- Current Evidence of Measurement Properties of Physical Activity Questionnaires for Older Adults: An Updated Systematic Review.Sports medicine (Auckland, N.Z.) · 2020Pooled it
- Association between parent and child physical activity: a systematic review.The international journal of behavioral nutrition and physical activity · 2020Pooled it
- A systematic literature review with meta-analyses of within- and between-day differences in objectively measured physical activity in school-aged children.Sports medicine (Auckland, N.Z.) · 2014Pooled it
- Association between physical activity bout length and physical functioning in older adults using absolute and relative intensity thresholds: a longitudinal cohort study.The journals of gerontology. Series A, Biological sciences and medical sciences · 2026Article
- Article
- Calibration and Validation of Machine Learning Models for Physical Behavior Characterization: Protocol and Methods for the Free-Living Physical Activity in Youth (FLPAY) Study.JMIR research protocols · 2025Article
- Behaviour-based movement cut-off points in 3-year old children comparing wrist- with hip-worn actigraphs MW8 and GT3X.PloS one · 2025Article
- Influence of pre-processing criteria on analysis of accelerometry-based physical activity.PloS one · 2025Article
- Effect of Data Reduction Techniques on Daily Moderate to Vigorous Physical Activity Collected with ActiGraphJournal of clinical medicine · 2023Article
- Characteristics associated with differences in 24-hour device-measured and self-reported sleep, sedentary behaviour and physical activity in a sample of Australian primary school children.Journal of activity, sedentary and sleep behaviors · 2023Article
- Calibrating Physical Activity and Sedentary Behavior for Hip-Worn Accelerometry in Older Women With Two Epoch Lengths: The Women's Health Initiative Objective Physical Activity and Cardiovascular Health Calibration Study.Journal for the measurement of physical behaviour · 2023Article
- The Influence of Accelerometer Epoch Length on Associations of Physical Activity Intensity and Volume with Bone Outcomes.Journal of sports science & medicine · 2023Article
- Short-term effect of physical activity on sleep health: A population-based study using accelerometry.Journal of sport and health science · 2022Article
- How adherence to the updated physical activity guidelines should be assessed with accelerometer?European journal of public health · 2022Article
- Physical activity intensity profiles associated with cardiometabolic risk in middle-aged to older men and women.Preventive medicine · 2022Article
- Article
- Assessment of Physical Activity in Adults Using Wrist Accelerometers.Epidemiologic reviews · 2022Review
- Association of physical activity intensity and bout length with mortality: An observational study of 79,503 UK Biobank participants.PLoS medicine · 2021Observational
Corrections and comments
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Authors and funding
6 authors.
Funding
Abstract
backgroundIt is difficult to compare accelerometer-derived estimates of moderate-to-vigorous physical activity (MVPA) between studies due to differences in data processing procedures. We aimed to evaluate the effects of accelerometer processing options on total and bout-accumulated time spent in MVPA in adults.
methods267 participants from the ProActive Trial provided 1236 days of valid physical activity (PA) data, collected using a 5-s epoch with ActiGraph GT1M accelerometers. We integrated data over 5-s to 60-s epoch lengths (EL) and applied two-level mixed effects regression models to MVPA time, defined using 1500 to 2500 counts/minute (cpm) cut-points (CP) and bout durations (BD) from 1 to 15 min.
resultsTotal MVPA time was lower on longer EL and higher CP (47 vs 26 min/day and 26 vs 5 min/day on 1500 vs 2500 cpm on 5-s and 60-s epoch, respectively); this could be approximated as MVPA=exp[2.197+0.279*log(CP)+6.120*log(EL) - 0.869*log(CP)*log(EL)] with an 800 min/day wear-time. In contrast, EL was positively associated with time spent in bout-accumulated MVPA; the approximating equation being MVPA=exp[54.679 - 6.268*log(CP)+6.387*log(EL) - 10.000*log(BD) - 0.162*log(EL)*log(BD) - 0.626*log(CP)*log(EL)+1.033*log(CP)*log(BD)]. BD and CP were inversely associated with MVPA, with higher values attenuating the influence of EL.
conclusionsEL, CP and BD interact to influence estimates of accelerometer-determined MVPA. In general, higher CP and longer BD result in lower MVPA but the direction of association for EL depends on BD. Reporting scaling coefficients for these key parameters across their frequently used ranges would facilitate comparisons of population-level accelerometry estimates of MVPA.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.