Discrepancies in accelerometer-measured physical activity in children due to cut-point non-equivalence and placement site

Ash C. Routen, Dominic Upton, Martin G. Edwards, Derek M. Peters

Research output: Contribution to journalArticle

Abstract

This study examined dissonance in physical activity (PA) between two youth-specific hip-derived intensity cut-points for the Actiwatch (AW), and compared PA between hip and wrist placements using site-specific cut-points. Twenty-four children aged 11.2 ± 0.5 years wore the AW on the right hip and non-dominant wrist during a typical school day. Minutes of sedentary behaviour and vigorous activity were greater using Puyau et al. (2002) cut-points, but light, moderate, and moderate-to-vigorous (MVPA) were greater when derived using Puyau et al. (2004) cut-points (P < 0.01). Total hip activity counts were lower than wrist. Sedentary minutes were greater at the hip, but minutes of light, vigorous and MVPA were lower (P < 0.01). Moderate minutes were greater at the hip, but differed only when applying the Puyau et al. (2004) cut-points (P < 0.01). In conclusion, data comparisons between two hip derived AW cut-points and between hip and wrist data are inappropriate. Future researchers using the AW at the hip should present data reduced using both published cut-points. As hip and wrist data differ, the wrist placement is preferable as it will likely increase children's compliance to monitoring protocols due to reduced obtrusiveness compared to the hip.

Original languageEnglish
Pages (from-to)1303-1310
Number of pages8
JournalJournal of Sports Sciences
Volume30
Issue number12
Early online date3 Aug 2012
DOIs
Publication statusPublished - 1 Dec 2012
Externally publishedYes

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