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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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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