REVISED2; IG ASSk paper ; JSS SUBMITTED FINAL.pdf (233.94 kB)
Average acceleration and intensity gradient of primary school children and associations with indicators of health and wellbeing
journal contributionposted on 2019-05-22, 11:35 authored by S Fairclough, S Taylor, A Rowlands, L Boddy, R Noonan
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 wellbeing indicators in children. ActiGraph GT9X wrist accelerometers were worn 24-h·d−1 56 over seven days 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 wellbeing 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 wellbeing, 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.
The study was funded by West Lancasire Sport Partnership, West Lancashire Leisure Trust, and Edge Hill University. AVR is with the NIHR Leicester Biomedical Research Centre, and the Collaboration for leadership in Applied Health Research and Care (CLAHRC) East Midlands.
CitationJournal of Sports Sciences, 2019, 37(18), pp. 2159-2167
Author affiliation/Organisation/COLLEGE OF LIFE SCIENCES/School of Medicine/Diabetes Research Centre
- AM (Accepted Manuscript)