Blaize Ashley N, Potteiger Jeffrey A, Claytor Randal P, Noe Douglas A
1Department of Kinesiology and Health, Miami University, Oxford, Ohio; 2Department of Movement Science, Grand Valley State University, Grand Rapids, Michigan; and 3Department of Statistics, Miami University, Oxford, Ohio.
J Strength Cond Res. 2014 Aug;28(8):2121-6. doi: 10.1519/JSC.0000000000000512.
The purpose of this study was to examine how fat mass affects the maximal fat oxidation rates of women. Fourteen active, healthy women (age, 21-31 years) with body composition ranging from 18.6 to 30.0% fat were divided into 2 groups (15-24.9% = lower-fat group; 25-35% = higher-fat group). On day 1, subjects performed a graded exercise test on the treadmill to determine maximal oxygen consumption (VO2max). On day 2, subjects were measured for % fat and performed a maximal fat oxidation test. Fat and carbohydrate oxidation rates were determined using gas exchange analysis. Fat oxidation in absolute (in gram per minute) and relative to fat-free body mass (in milligram per kilogram of fat-free mass per minute) was determined using stoichiometric equations and appropriate energy equivalents. There were no significant differences (p > 0.05) in maximal fat oxidation rates between the women in lower-fat (0.39 ± 0.10 g·min-1, 8.52 ± 2.69 mg·kg FFM·min-1) and higher-fat (0.49 ± 0.13 g·min-1, 10.81 ± 2.80 mg·kg-1 FFM·min-1) groups. Maximal fat oxidation occurred at an exercise intensity of 55.7 ± 11.1% and 59.1 ± 5.4% VO2max for the lower-fat and higher-fat groups, respectively, with no significant difference between groups (p > 0.05). The maximal fat oxidation rate (g·min-1 and mg·kg-1 FFM·min-1) was not significantly correlated with any of the descriptive variables (fat mass, fat-free mass, percent body fat, or VO2max). In conclusion, personal trainers and health practitioners can use the exercise intensities that elicited the highest rate of fat oxidation to prescribe exercise programs to women, despite their body composition, that prevent weight gain and/or promote body fat and body weight loss.
本研究的目的是探讨脂肪量如何影响女性的最大脂肪氧化率。14名活跃、健康的女性（年龄21 - 31岁），体脂率在18.6%至30.0%之间，被分为两组（15 - 24.9% = 低脂肪组；25 - 35% = 高脂肪组）。第1天，受试者在跑步机上进行分级运动测试以确定最大摄氧量（VO2max）。第2天，测量受试者的体脂百分比并进行最大脂肪氧化测试。使用气体交换分析确定脂肪和碳水化合物的氧化率。使用化学计量方程和适当的能量当量确定绝对脂肪氧化量（以克/分钟为单位）以及相对于去脂体重的脂肪氧化量（以毫克/千克去脂体重/分钟为单位）。低脂肪组（0.39±0.10克·分钟-1，8.52±2.69毫克·千克去脂体重·分钟-1）和高脂肪组（0.49±0.13克·分钟-1，10.81±2.80毫克·千克-1去脂体重·分钟-1）女性的最大脂肪氧化率之间无显著差异（p>0.05）。低脂肪组和高脂肪组的最大脂肪氧化分别发生在运动强度为55.7±11.1%和59.1±5.4%VO2max时，两组之间无显著差异（p>0.05）。最大脂肪氧化率（克·分钟-1和毫克·千克-1去脂体重·分钟-1）与任何描述性变量（脂肪量、去脂体重、体脂百分比或VO2max）均无显著相关性。总之，私人教练和健康从业者可以使用能引发最高脂肪氧化率的运动强度为女性制定运动计划，无论其身体成分如何，以防止体重增加和/或促进体脂和体重减轻。
