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Development of cut-points for determining activity intensity from a wrist-worn ActiGraph accelerometer in free-living adults.
- Source :
-
Journal of Sports Sciences . Nov2020, Vol. 38 Issue 22, p2569-2578. 10p. 1 Black and White Photograph, 6 Charts, 3 Graphs. - Publication Year :
- 2020
-
Abstract
- Despite recent popularity of wrist-worn accelerometers for assessing free-living physical behaviours, there is a lack of user-friendly methods to characterize physical activity from a wrist-worn ActiGraph accelerometer. Participants in this study completed a laboratory protocol and/or 3–8 hours of directly observed free-living (criterion measure of activity intensity) while wearing ActiGraph GT9X Link accelerometers on the right hip and non-dominant wrist. All laboratory data (n = 36) and 11 participants' free-living data were used to develop vector magnitude count cut-points (counts/min) for activity intensity for the wrist-worn accelerometer, and 12 participants' free-living data were used to cross-validate cut-point accuracy. The cut-points were: <2,860 counts/min (sedentary); 2,860–3,940 counts/min (light); and ≥3,941counts/min (moderate-to-vigorous (MVPA)). These cut-points had an accuracy of 70.8% for assessing free-living activity intensity, whereas Sasaki/Freedson cut-points for the hip accelerometer had an accuracy of 77.1%, and Hildebrand Euclidean Norm Minus One (ENMO) cut-points for the wrist accelerometer had an accuracy of 75.2%. While accuracy was higher for a hip-worn accelerometer and for ENMO wrist cut-points, the high wear compliance of wrist accelerometers shown in past work and the ease of use of count-based analysis methods may justify use of these developed cut-points until more accurate, equally usable methods can be developed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02640414
- Volume :
- 38
- Issue :
- 22
- Database :
- Academic Search Index
- Journal :
- Journal of Sports Sciences
- Publication Type :
- Academic Journal
- Accession number :
- 146849941
- Full Text :
- https://doi.org/10.1080/02640414.2020.1794244