Fairclough, Stuart J, Hurter, Liezel, Dumuid, Dorothea, Gaba, Ales, Rowlands, Alex V, Cruz, Borja del Pozo, Cox, Ashley, Crotti, Matteo, Foweather, Lawrence, Graves, Lee EF et al (show 8 more authors)
(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).
8778-.
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Fairclough (2022) The physical behaviour intensity spectrum and body mass index in school-aged youth - a compositional analysis of pooled individual participant data.pdf - Published version Download (573kB) | Preview |
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 (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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | accelerometer, CoDa, children, adolescents, physical activity, adiposity, intensity spectrum |
| Divisions: | Faculty of Health and Life Sciences Faculty of Health and Life Sciences > Institute of Population Health |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 19 Jul 2022 11:38 |
| Last Modified: | 16 Mar 2023 22:46 |
| DOI: | 10.3390/ijerph19148778 |
| Open Access URL: | https://www.mdpi.com/1660-4601/19/14/8778/pdf |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3158900 |
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