Effects of adipose tissue distribution on maximum lipid oxidation rate during exercise in normal-weight women - 17/06/14
Abstract |
Aim |
Fat mass localization affects lipid metabolism differently at rest and during exercise in overweight and normal-weight subjects. The aim of this study was to investigate the impact of a low vs high ratio of abdominal to lower-body fat mass (index of adipose tissue distribution) on the exercise intensity (Lipoxmax) that elicits the maximum lipid oxidation rate in normal-weight women.
Methods |
Twenty-one normal-weight women (22.0±0.6 years, 22.3±0.1kg.m−2) were separated into two groups of either a low or high abdominal to lower-body fat mass ratio [L-A/LB (n=11) or H-A/LB (n=10), respectively]. Lipoxmax and maximum lipid oxidation rate (MLOR) were determined during a submaximum incremental exercise test. Abdominal and lower-body fat mass were determined from DXA scans.
Results |
The two groups did not differ in aerobic fitness, total fat mass, or total and localized fat-free mass. Lipoxmax and MLOR were significantly lower in H-A/LB vs L-A/LB women (43±3% VO2max vs 54±4% VO2max, and 4.8±0.6mgmin−1kg FFM−1 vs 8.4±0.9mgmin−1kg FFM−1, respectively; P<0.001). Total and abdominal fat mass measurements were negatively associated with Lipoxmax (r=–0.57 and r=–0.64, respectively; P<0.01) and MLOR [r=–0.63 (P<0.01) and r=–0.76 (P<0.001), respectively].
Conclusion |
These findings indicate that, in normal-weight women, a predominantly abdominal fat mass distribution compared with a predominantly peripheral fat mass distribution is associated with a lower capacity to maximize lipid oxidation during exercise, as evidenced by their lower Lipoxmax and MLOR.
Le texte complet de cet article est disponible en PDF.Keywords : Women, Adipose tissue localization, Exercise, Metabolic fitness, Lipoxmax
Abbreviations : A/LB, ANP, BMI, CHO, DXA, FFA, FFM, FM, H-A/LB, L-A/LB, MAP, MLOR, NW, SD, VCO2, VO2, VO2max
Plan
Vol 40 - N° 3
P. 215-219 - juin 2014 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.