Relations of body fatness and cardiovascular fitness to lipid profile in black and white adolescents.
High body fatness is associated with unfavorable cardiovascular disease risk profiles in juveniles. However, the degree to which the deleterious effects attributed to fatness may actually be due to the low cardiovascular fitness (CVF) that is usually confounded with fatness is not known. This study determined in 14- to 18-y-old (n = 398) youths the degree to which percentage body fat (%BF) and CVF explained variability in lipids and lipoproteins. Blood samples were taken after a 12-h fast. %BF was measured with dual-energy x-ray absorptiometry. CVF was determined with a multistage treadmill test. The degree to which %BF and CVF explained variance in outcome variables was determined by regression analyses, controlling for demographic variables before entering %BF or CVF and their interactions with race and sex. Because %BF and CVF were highly correlated (r = -0.69, p < 0.001), they were first entered separately in the regression models before being considered together. Both higher %BF and lower CVF were associated with unfavorable concentrations of total cholesterol to HDLC ratio and triglycerides. However, the effects of %BF and CVF were not additive; once %BF was in the regression model, CVF did not explain additional variance. For Lp(a), only %BF explained a significant portion of the variance. For triglycerides, there was a %BF by race interaction, such that the deleterious effects of high %BF were greater in whites than in blacks. These results suggest that interventions to improve lipid profile in youths should be designed primarily to minimize fatness.
Gutin
Bernard
B
Department of Pediatrics, Georgia Prevention Institute, Medical College of Georgia, 1499 Walton Way, Augusta, GA 30912, USA. bgutin@mcg.edu
Yin
Zenong
Z
Humphries
Matthew C
MC
Bassali
Reda
R
Le
Ngoc-Anh
NA
Daniels
Stephen
S
Barbeau
Paule
P
D015502:Absorptiometry, Photon; D000273:Adipose Tissue / Q000473:pathology*; D000293:Adolescent; D000367:Age Factors; D044383:Black People; D001823:Body Composition; D001824:Body Constitution; D001835:Body Weight; D002319:Cardiovascular System; D005260:Female; D006801:Humans; D050356:Lipid Metabolism; D008074:Lipoproteins / Q000378:metabolism; D008077:Lipoproteins, LDL / Q000378:metabolism; D008297:Male; D010809:Physical Fitness; D012044:Regression Analysis; D014280:Triglycerides / Q000378:metabolism; D044465:White People
D008074:Lipoproteins; D008077:Lipoproteins, LDL; D014280:Triglycerides