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Average acceleration and intensity gradient of primary school children and associations with indicators of health and well-being.

Authors
  • Fairclough, Stuart J1
  • Taylor, Sarah2
  • Rowlands, Alex V3, 4, 5
  • Boddy, Lynne M6
  • Noonan, Robert J7
  • 1 a Movement Behaviours, Health, and Wellbeing Research Group, Department of Sport and Physical Activity , Edge Hill University , Ormskirk , UK.
  • 2 b Department of Physical Education and Sports Sciences , University of Limerick , Limerick , Ireland. , (Ireland)
  • 3 c Diabetes Research Centre , University of Leicester, Leicester General Hospital , Leicester , UK.
  • 4 d NIHR Leicester Biomedical Research Centre , UK.
  • 5 e Alliance for Research in Exercise, Nutrition and Activity (ARENA), Sansom Institute for Health Research, Division of Health Sciences , University of South Australia , Adelaide , Australia. , (Australia)
  • 6 f Physical Activity Exchange, Research Institute for Sport and Exercise Sciences , Liverpool John Moores University , Liverpool , UK.
  • 7 g Appetite and Obesity Research Group, Department of Psychological Sciences , University of Liverpool , Liverpool , UK.
Type
Published Article
Journal
Journal of Sports Sciences
Publisher
Informa UK (Taylor & Francis)
Publication Date
Sep 01, 2019
Volume
37
Issue
18
Pages
2159–2167
Identifiers
DOI: 10.1080/02640414.2019.1624313
PMID: 31156048
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Average acceleration (AvAcc) and intensity gradient (IG) have been proposed as standardised metrics describing physical activity (PA) volume and intensity, respectively. We examined hypothesised between-group PA differences in AvAcc and IG, and their associations with health and well-being indicators in children. ActiGraph GT9X wrist accelerometers were worn for 24-h·d-1 over 7days by 145 children aged 9-10. Raw accelerations were averaged per 5-s epoch to represent AvAcc over 24-h. IG represented the relationship between log values for intensity and time. Moderate-to-vigorous PA (MVPA) was estimated using youth cutpoints. BMI z-scores, waist-to-height ratio (WHtR), peak oxygen uptake (VO2peak), Metabolic Syndrome risk (MetS score), and well-being were assessed cross-sectionally, and 8-weeks later. Hypothesised between-group differences were consistently observed for IG only (p < .001). AvAcc was strongly correlated with MVPA (r = 0.96), while moderate correlations were observed between IG and MVPA (r = 0.50) and AvAcc (r = 0.54). IG was significantly associated with health indicators, independent of AvAcc (p < .001). AvAcc was associated with well-being, independent of IG (p < .05). IG was significantly associated with WHtR (p < .01) and MetS score (p < .05) at 8-weeks follow-up. IG is sensitive as a gauge of PA intensity that is independent of total PA volume, and which relates to important health indicators in children.

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