The use of the intensity gradient and average acceleration metrics to explore associations with BMI z-score in children

Duncan S. Buchan, Gillian McLellan, Samantha Donnelly, Rosie Arthur

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)
83 Downloads (Pure)

Abstract

This study used the intensity gradient (IG) and average acceleration metrics to describe children’s activity profiles and explore associations with body mass index (BMI) z-score. Two hundred and forty-six children (n = 138 girls) aged 9.6 ± 1.4 years wore a wrist-mounted ActiGraph wGT3X-BT accelerometer for 7 days on their non-dominant wrist. Physical activity (PA) metrics captured included: the IG which describes the intensity distribution of accelerations across the 24 h monitoring period; average acceleration which provides a measure of the volume of activity; total moderate-to-vigorous PA (MVPA) and inactive time. Acceleration was averaged over 5s epochs. Finally, BMI z-score was calculated for each participant. Average acceleration was negatively associated with BMI z-score (p<0.05) independent of age and gender but not IG. The IG was negatively associated with BMI z-score independent of potential correlates and average acceleration. Total MVPA was not associated with BMI-z score. The IG and average acceleration metrics may be used to explore the independent or cumulative effects of the volume and intensity distribution of activity upon measures of health and well-being in children to inform specific activity recommendations.
Original languageEnglish
Pages (from-to)2751-2758
Number of pages8
JournalJournal of Sports Sciences
Volume37
Issue number23
Early online date10 Sep 2019
DOIs
Publication statusPublished - 2 Dec 2019

Keywords

  • ActiGraph
  • Accelerometer
  • Activity metrics
  • Wrist-worn
  • Raw acceleration

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