The physical behaviour intensity spectrum and body mass index in school-aged youth: A compositional analysis of pooled individual participant data
Fairclough, Stuart J.; Hurter, Liezel; Dumuid, Dorothea; Gába, Ales; Rowlands, Alex V.; del Pozo Cruz, Borja; Cox, Ashley; Crotti, Matteo; Foweather, Lawrence; Jones, Owen R.; McCann, Debroah A.; Noonan, Robert J.; Owen, Michael B.; Rudd, James Robert; Taylor, Sarah L; Tyler, Richard; Boddy, Lynne M; Graves, Lee E. F.
Peer reviewed, Journal article
Published version
Permanent lenke
https://hdl.handle.net/11250/3035375Utgivelsesdato
2022Metadata
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Originalversjon
International Journal of Environmental Research and Public Health. 2022, 19(14), Artikkel 8778. 10.3390/ijerph19148778Sammendrag
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.
Beskrivelse
This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).