Physical activity, not sedentary time, predicts dual-energy X-ray absorptiometry-measured adiposity age 5 to 19 years

Kathleen F Janz; Piroska Boros; Elena M Letuchy; Trudy L Burns; Steven M Levy; Soyang Kwon

doi:10.1249/MSS.0000000000001336

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Physical activity, not sedentary time, predicts dual-energy X-ray absorptiometry-measured adiposity age 5 to 19 years

Journal article

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Physical activity, not sedentary time, predicts dual-energy X-ray absorptiometry-measured adiposity age 5 to 19 years

Kathleen F Janz, Piroska Boros, Elena M Letuchy, Trudy L Burns, Steven M Levy and Soyang Kwon

Medicine and Science in Sports and Exercise, Vol.49(10), pp.2071-2077

2017

DOI: 10.1249/MSS.0000000000001336

PMID: 28915225

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https://www.ncbi.nlm.nih.gov/pmc/articles/5712279View

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Abstract

PURPOSE: To examine the associations among physical activity (PA), sedentary time (SED), and TV viewing (TV) with fat mass (FAT) and visceral adipose tissue mass (VAT) from childhood through adolescence (5-19 years).METHODS: Participants in the Iowa Bone Development Study (n = 230 males and 233 females) were examined at ages 5, 8, 11, 13, 15, 17 & 19 years. Accelerometers measured moderate- or vigorous-intensity PA (MVPA; min/day), light-intensity PA (LPA; min/day), and SED (h/day). Parent-proxy report (5 & 8 years) and child-report (11, 13, 15, 17, & 19 years) measured TV (h/day). DXA scans measured FAT (kg) and VAT (g). Sex-specific growth models were used to create FAT and VAT growth curves for individual participants (level 1), and to test the effect of MVPA, LPA, SED, & TV (level 2) after adjusting for weight, height, linear age, non-linear age, and maturity.RESULTS: Growth models indicated that low levels of MVPA were associated with high levels of FAT and VAT for males and high levels of FAT for females. TV was positively associated with FAT and VAT for males and females. LPA was positively associated with FAT in males. SED was not associated with FAT or VAT for males or females (p > 0.05).CONCLUSION: This study supports current PA guidelines focusing on MVPA rather than SED. The contribution of high TV, but not high SED, to high levels of adiposity suggests that TV's contribution to obesity is not just a function of low energy expenditure.

Details

Title: Subtitle: Physical activity, not sedentary time, predicts dual-energy X-ray absorptiometry-measured adiposity age 5 to 19 years
Creators: Kathleen F Janz
Piroska Boros
Elena M Letuchy
Trudy L Burns
Steven M Levy
Soyang Kwon
Resource Type: Journal article
Publication Details: Medicine and Science in Sports and Exercise, Vol.49(10), pp.2071-2077
DOI: 10.1249/MSS.0000000000001336
PMID: 28915225
NLM abbreviation: Med Sci Sports Exerc
ISSN: 0195-9131
eISSN: 1530-0315
Language: English
Date published: 2017
Academic Unit: Preventive and Community Dentistry; Epidemiology; Health, Sport, and Human Physiology
Record Identifier: 9983917767602771

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