Does light-intensity physical activity moderate the relationship between sitting time and adiposity markers in adolescents?
•Adolescents’ waking hours were spent sitting (68% of waking hours), in light intensity physical activity (17%), and in moderate-to-vigorous intensity physical activity (5.3%).•There was no association between sitting and adiposity markers•Light-intensity physical activity moderated associations bet...
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Veröffentlicht in: | Journal of sport and health science 2022-09, Vol.11 (5), p.613-619 |
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Zusammenfassung: | •Adolescents’ waking hours were spent sitting (68% of waking hours), in light intensity physical activity (17%), and in moderate-to-vigorous intensity physical activity (5.3%).•There was no association between sitting and adiposity markers•Light-intensity physical activity moderated associations between sitting and adiposity markers among adolescents•Adolescents who sat more during waking hours tended to have lower body mass index and waist circumference if they spent approximately >300 min/day in light-intensity physical activity.
While the relationship between sedentary time and adiposity markers may be independent of moderate-to-vigorous intensity physical activity (MVPA) among adolescents, little is known about the role of light-intensity physical activity (LIPA) in this relationship. The aim of this cross-sectional study was to examine whether device-measured LIPA and MVPA moderate the associations between objectively measured sitting time and adiposity markers (body mass index (BMI)) and waist circumference (WC)) among adolescents.
This study included accelerometer and inclinometer data obtained from 219 adolescents (age = 14.9 ± 1.6 years, mean ± SD), collected during 2014 and 2015 in Melbourne, Australia. ActiGraph GT3X accelerometers were used to determine time spent in total-LIPA (101 counts/min to 3.99 metabolic equivalents(METs)), low-LIPA (101–799 counts/min), high-LIPA (800 counts/min to 3.99 METs), and MVPA (≥ 4 METs). The average time spent sitting was obtained from activPAL inclinometers. Anthropometric measures were assessed by trained staff. Interactions between sitting and total-LIPA, low-LIPA, high-LIPA, and MVPA on BMI z-score (zBMI) and WC z-score (zWC), respectively, were examined using linear regression, adjusting for age and sex; and moderation by total-LIPA, low-LIPA, high-LIPA, and MVPA were examined by adding interaction terms. Significant interaction effects were probed by comparing associations at the mean and at 1 SD below and above the mean.
Total-LIPA significantly moderated the association between sitting time and zBMI, and low-LIPA significantly moderated the association between sitting time and zBMI and zWC. No other associations were found for total-LIPA, high-LIPA, or MVPA. Specifically, at high levels of total-LIPA (+1 SD), there is a negative association between sitting time and zBMI. In addition, at high levels of low-LIPA (+1 SD), there is a negative association between sitting time and zBMI and zWC.
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ISSN: | 2095-2546 2213-2961 |
DOI: | 10.1016/j.jshs.2020.04.002 |