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

Authors
  • Buchan, Duncan S1
  • McLellan, Gillian1
  • Donnelly, Samantha1
  • Arthur, Rosie1
  • 1 School of Health and Life Sciences, Institute of Clinical Exercise and Health Science , South Lanarkshire , Scotland.
Type
Published Article
Journal
Journal of Sports Sciences
Publisher
Informa UK (Taylor & Francis)
Publication Date
Dec 01, 2019
Volume
37
Issue
23
Pages
2751–2758
Identifiers
DOI: 10.1080/02640414.2019.1664536
PMID: 31506039
Source
Medline
Keywords
Language
English
License
Unknown

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.

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