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

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Fairclough, SJ orcid iconORCID: 0000-0001-8358-1979, Hurter, L, Dumuid, D orcid iconORCID: 0000-0003-3057-0963, Gába, A orcid iconORCID: 0000-0002-7236-9072, Rowlands, AV orcid iconORCID: 0000-0002-1463-697X, Cruz, BDP, Cox, A orcid iconORCID: 0000-0002-4866-4688, Crotti, M, Foweather, L orcid iconORCID: 0000-0001-9851-5421, Graves, LEF orcid iconORCID: 0000-0002-3323-313X, Jones, O, McCann, DA, Noonan, RJ orcid iconORCID: 0000-0001-9575-5729, Owen, MB orcid iconORCID: 0000-0002-7960-2404, Rudd, JR, Taylor, SL orcid iconORCID: 0000-0002-4875-9951, Tyler, R orcid iconORCID: 0000-0001-9756-5582 and Boddy, LM orcid iconORCID: 0000-0002-7477-4389 (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 and Exercise Sciences
Publisher: MDPI
Date of acceptance: 15 July 2022
Date of first compliant Open Access: 1 August 2022
Date Deposited: 01 Aug 2022 12:42
Last Modified: 05 Jul 2025 14:45
DOI or ID number: 10.3390/ijerph19148778
URI: https://researchonline.ljmu.ac.uk/id/eprint/17322
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