期刊
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
卷 19, 期 14, 页码 -出版社
MDPI
DOI: 10.3390/ijerph19148778
关键词
accelerometer; CoDa; children; adolescents; physical activity; adiposity; intensity spectrum
资金
- Waterloo Foundation [1669/3509]
- West Lancashire Sport Partnership
- West Lancashire Leisure Trust
- Edge Hill University
- Wigan Council
- Lifestyle Theme of the Leicester NHR Leicester Biomedical Research Centre
- NIHR Applied Research Collaborations East Midlands (ARC-EM)
- Australian National Health and Medical Research Council (NHMRC) Early Career Fellowship [APP1162166]
- Centre of Research Excellence in Driving Global Investment in Adolescent Health - NHMRC [APP1171981]
This study examined the associations between acceleration intensity bands and body mass index (BMI) z-score in youth. The findings showed that the >= 700 mg intensity band was strongly and inversely associated with BMI z-score. Reallocation of time between intensity bands resulted in clinically meaningful differences in BMI z-score.
We examined the compositional associations between the intensity spectrum derived from incremental acceleration intensity bands and the body mass index (BMI) z-score in youth, and investigated the estimated differences in BMI z-score following time reallocations between intensity bands. School-aged youth from 63 schools wore wrist accelerometers, and data of 1453 participants (57.5% girls) were analysed. Nine acceleration intensity bands (range: 0-50 mg to >= 700 mg) were used to generate time-use compositions. Multivariate regression assessed the associations between intensity band compositions and BMI z-scores. Compositional isotemporal substitution estimated the differences in BMI z-score following time reallocations between intensity bands. The >= 700 mg intensity bandwas strongly and inversely associated with BMI z-score (p < 0.001). The estimated differences in BMI z-score when 5 min were reallocated to and from the >= 700 mg band and reallocated equally among the remaining bands were -0.28 and 0.44, respectively (boys), and -0.39 and 1.06, respectively (girls). The time in the >= 700 mg intensity band was significantly associated with BMI z-score, irrespective of sex. When even modest durations of time in this band were reallocated, the asymmetrical estimated differences in BMI z-score were clinically meaningful. The findings highlight the utility of the full physical activity intensity spectrum over a priori-determined absolute intensity cut-point approaches.
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