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The Physical Behaviour Intensity Spectrum and Body Mass Index in School-Aged Youth: A Compositional Analysis of Pooled Individual Participant Data.

Fairclough, SJ, Hurter, L, Dumuid, D, Gába, A, Rowlands, AV, Cruz, BDP, Cox, A, Crotti, M, Foweather, L, Graves, LEF, Jones, O, McCann, DA, Noonan, RJ, Owen, MB, Rudd, JR, Taylor, SL, Tyler, R and Boddy, LM (2022) The Physical Behaviour Intensity Spectrum and Body Mass Index in School-Aged Youth: A Compositional Analysis of Pooled Individual Participant Data. International Journal of Environmental Research and Public Health, 19 (14). p. 8778. ISSN 1661-7827

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Open Access URL: https://doi.org/10.3390/ijerph19148778 (Published version)

Abstract

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 (<i>p</i> &lt; 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.

Item Type: Article
Uncontrolled Keywords: Humans; Body Mass Index; Exercise; Acceleration; Schools; Adolescent; Child; Female; Male; Sedentary Behavior; CoDa; accelerometer; adiposity; adolescents; children; intensity spectrum; physical activity; Acceleration; Adolescent; Body Mass Index; Child; Exercise; Female; Humans; Male; Schools; Sedentary Behavior; Toxicology
Subjects: R Medicine > RA Public aspects of medicine > RA0421 Public health. Hygiene. Preventive Medicine
R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: MDPI
SWORD Depositor: A Symplectic
Date Deposited: 01 Aug 2022 12:42
Last Modified: 03 Aug 2022 10:31
DOI or ID number: 10.3390/ijerph19148778
URI: https://researchonline.ljmu.ac.uk/id/eprint/17322
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