Evaluating the responsiveness of accelerometry to detect change in physical activity

Montoye, Alexander H., Pfeiffer, Karen A., Suton, Darijan, & Trost, Stewart G. (2014) Evaluating the responsiveness of accelerometry to detect change in physical activity. Measurement in Physical Education and Exercise Science, 18(4), pp. 273-285.

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The responsiveness to change of the Actical and ActiGraph accelerometers was assessed in children and adolescents. Participants (n=208) aged 6-16 years completed two simulated free-living protocols, one with primarily light-to-moderate physical activities (PA) and one with mostly moderate-to-vigorous PA. Time in sedentary, light, moderate, and vigorous PA was estimated using 8 previously developed cut-points (4 for Actical and 4 for ActiGraph) and 15-s and 30-s epochs. Accelerometer responsiveness for detecting differences in PA between protocols was assessed using standardized response means (SRM). SRM values >/=0.8 represented high responsiveness to change. Both accelerometers showed high responsiveness for all PA intensities (SRMs = 1.2-4.7 for Actical and 1.1-3.3 for ActiGraph). All cut-points and epoch lengths yielded high responsiveness, and choice of cut-points and epoch length had little effect on responsiveness. Thus, both the Actical and ActiGraph can detect change in PA in a simulated free-living setting, irrespective of cut-point selection or epoch length.

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ID Code: 78787
Item Type: Journal Article
Refereed: Yes
DOI: 10.1080/1091367X.2014.942454
ISSN: 1091-367X
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > HUMAN MOVEMENT AND SPORTS SCIENCE (110600)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Exercise & Nutrition Sciences
Copyright Owner: Copyright 2014 Taylor & Francis Group
Deposited On: 19 Nov 2014 23:45
Last Modified: 20 Nov 2014 23:32

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