| Title | Relations of moderate and vigorous physical activity to fitness and fatness in adolescents. | | Author(s) | Gutin B, Yin Z, Humphries MC, Barbeau P | | Institution | Georgia Prevention Institute, Department of Pediatrics, Medical College of Georgia, Augusta, GA, USA. bgutin@mcg.edu | | Source | Am J Clin Nutr 2005 Apr; 81(4):746-50. | | MeSH | Adipose Tissue
Adolescent
Adolescent Development
Body Composition
Cross-Sectional Studies
Densitometry, X-Ray
Female
Georgia
Humans
Kinetocardiography
Male
Physical Fitness
Regression Analysis
Research Support, U.S. Gov't, P.H.S.
| | Abstract | BACKGROUND: It is unclear how moderate and vigorous intensities of physical activity (PA) are associated with cardiovascular fitness (CVF) and percentage of body fat (%BF) in adolescents.
OBJECTIVE: We tested the hypothesis that vigorous PA, to a greater degree than moderate PA, would be associated with better CVF and lower %BF.
DESIGN: This was a cross-sectional study of 421 black and white high school students (x age: 16 y). PA was measured with 5 d of accelerometry and expressed in min/d of moderate or vigorous PA. CVF was measured with a multistage treadmill test and was expressed as the oxygen consumption at a heart rate of 170 bpm. %BF was measured with dual-energy X-ray absorptiometry. Multiple regressions were used to determine the degree to which variance in CVF and %BF was explained by PA, after control for age, sex, race, and the sex x race interaction.
RESULTS: A higher index for CVF was associated with higher amounts of moderate and vigorous PA; more variance was explained by vigorous than by moderate PA. Lower %BF was associated with higher amounts of vigorous PA but not with the amount of moderate PA.
CONCLUSION: Black and white adolescents who engaged in relatively large amounts of free-living vigorous exercise were likely to be relatively fit and lean. | | Language | eng | | Pub Type(s) | Clinical Trial
Journal Article
| | PubMed ID | 15817847 |
|
