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dc.contributor.authorCarson, V.
dc.contributor.authorRidgers, N.
dc.contributor.authorHoward, B.
dc.contributor.authorWinkler, E.
dc.contributor.authorHealy, Genevieve
dc.contributor.authorOwen, N.
dc.contributor.authorDunstan, D.
dc.contributor.authorSalmon, J.
dc.date.accessioned2017-01-30T15:36:28Z
dc.date.available2017-01-30T15:36:28Z
dc.date.created2015-10-29T04:09:34Z
dc.date.issued2013
dc.identifier.citationCarson, V. and Ridgers, N. and Howard, B. and Winkler, E. and Healy, G. and Owen, N. and Dunstan, D. et al. 2013. Light-Intensity Physical Activity and Cardiometabolic Biomarkers in US Adolescents. PLoS ONE. 8 (8): Article ID e71417.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/47930
dc.identifier.doi10.1371/journal.pone.0071417
dc.description.abstract

Background: The minimal physical activity intensity that would confer health benefits among adolescents is unknown. The purpose of this study was to examine the associations of accelerometer-derived light-intensity (split into low and high) physical activity, and moderate- to vigorous-intensity physical activity with cardiometabolic biomarkers in a large population-based sample. Methods: The study is based on 1,731 adolescents, aged 12-19 years from the 2003/04 and 2005/06 National Health and Nutrition Examination Survey. Low light-intensity activity (100-799 counts/min), high light-intensity activity (800 counts/min to <4 METs) and moderate- to vigorous-intensity activity (≥4 METs, Freedson age-specific equation) were accelerometer-derived. Cardiometabolic biomarkers, including waist circumference, systolic blood pressure, diastolic blood pressure, HDL-cholesterol, and C-reactive protein were measured. Triglycerides, LDL- cholesterol, insulin, glucose, and homeostatic model assessments of ß-cell function (HOMA-%B) and insulin sensitivity (HOMA-%S) were also measured in a fasting sub-sample (n=807).Results: Adjusted for confounders, each additional hour/day of low light-intensity activity was associated with 0.59 (95% CI: 1.18-0.01) mmHG lower diastolic blood pressure. Each additional hour/day of high light-intensity activity was associated with 1.67 (2.94-0.39) mmHG lower diastolic blood pressure and 0.04 (0.001-0.07) mmol/L higher HDL-cholesterol. Each additional hour/day of moderate- to vigorous-intensity activity was associated with 3.54 (5.73-1.35) mmHG lower systolic blood pressure, 5.49 (1.11-9.77)% lower waist circumference, 25.87 (6.08-49.34)% lower insulin, and 16.18 (4.92-28.53)% higher HOMA-%S.Conclusions: Time spent in low light-intensity physical activity and high light-intensity physical activity had some favorable associations with biomarkers. Consistent with current physical activity recommendations for adolescents, moderate- to vigorous-intensity activity had favorable associations with many cardiometabolic biomarkers. While increasing MVPA should still be a public health priority, further studies are needed to identify dose-response relationships for light-intensity activity thresholds to inform future recommendations and interventions for adolescents.

dc.titleLight-Intensity Physical Activity and Cardiometabolic Biomarkers in US Adolescents
dc.typeJournal Article
dcterms.source.volume8
dcterms.source.number8
dcterms.source.titlePLoS ONE
curtin.departmentSchool of Physiotherapy and Exercise Science
curtin.accessStatusOpen access via publisher


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