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Prospective associations between sedentary time, sleep duration and adiposity in adolescents.


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Authors

Collings, Paul J 
Ridgway, Charlotte L 

Abstract

OBJECTIVE: The objective of this study was to investigate whether objectively measured sedentary time and sleep duration are associated with changes in adiposity from mid- to late adolescence. METHODS: Students (n = 504, 42% boys) were recruited from schools in Cambridgeshire, UK. At baseline (mean age 15.0 ± 0.3 years), sedentary time was objectively measured by ≥3 days of combined heart rate and movement sensing. Concurrently, sleep duration was measured by combined sensing in conjunction with self-reported bed times. Fat mass index (FMI; kg/m(2)) was estimated at baseline and follow-up (17.5 ± 0.3 years) by anthropometry and bioelectrical impedance. FMI change (ΔFMI) was calculated by subtracting the baseline from follow-up values. Linear regression models adjusted for basic demographics, moderate-to-vigorous physical activity (MVPA), and depressive symptoms were used to investigate associations of sedentary time and sleep duration (mutually adjusted for one another) with ΔFMI. RESULTS: FMI increased by 0.5 and 0.6 kg/m(2) in boys and girls, respectively, but there was no association between sedentary time and ΔFMI in either gender (p ≥ 0.087), and no association between sleep duration and ΔFMI in girls (p ≥ 0.61). In boys, each additional hour of baseline sleep significantly reduced the ΔFMI by 0.13 kg/m(2) (p = 0.049), but there was little evidence for this association after adjusting for MVPA and depressive symptoms (p = 0.15). CONCLUSIONS: Sedentary time may not determine changes in adiposity from mid- to late adolescence, nor may sleep duration in girls. However, sleep length may be inversely associated with adiposity gain in boys, depending on whether the relationship is confounded or mediated by MVPA and depression.

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Keywords

Body fatness, Cohort study, Obesity, Sedentariness, Sleep length, Youth, Adolescent, Body Mass Index, Cohort Studies, England, Female, Humans, Male, Motor Activity, Pediatric Obesity, Prospective Studies, Risk Factors, Sedentary Behavior, Sex Factors, Sleep, Sleep Deprivation, Statistics as Topic

Journal Title

Sleep Med

Conference Name

Journal ISSN

1389-9457
1878-5506

Volume Title

16

Publisher

Elsevier BV
Sponsorship
Medical Research Council (MC_UU_12015/3)
Wellcome Trust (074296/Z/04/Z)
British Heart Foundation (None)
Medical Research Council (MC_UU_12015/7)
Medical Research Council (MC_U106179473)
This work was supported by the Medical Research Council (Unit Programme number MC_UU_12015/3), the Wellcome Trust (grant 074296/Z/04/Z) and the British Heart Foundation (grant FS/12/58/29709 to KW).