肥胖和正常体重妇女在亚极限运动中的底物利用。

H G Steffan, W Elliott, W C Miller, B Fernhall
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引用次数: 35

摘要

在这项研究中,我们比较了肥胖和正常体重女性在最大分级运动试验(GXT)的次最大强度下的底物使用情况,以及在连续次最大稳定状态运动中等效强度的底物使用情况。久坐肥胖(n = 20,体脂> 30%)和正常体重(n = 15,体脂<或=30%)的妇女进行了三项跑步机测试,同时进行了代谢测量。采用Bruce方案测定最大耗氧量(VO2max),随后在不同日期随机分配两次连续15分钟的稳态运动;一次是50% VO2max一次是75% VO2max方差分析显示,两组之间在运动期间任何时刻的血乳酸或呼吸交换比(R)值均无显著差异。因此,我们将肥胖组和正常体重组的数据结合起来进行后续分析。50% VO2max时GXT的R[0.83(0.01)]显著低于稳态运动8 min[0.90(0.01)]和15 min [0.89 (0.01)] (P < 0.05),而75% VO2max时GXT的R[0.96(0.01)]与稳态运动8 min[0.96(0.01)]和15 min[0.93(0.01)]相似。50% VO2max时GXT血乳酸值[1.66 (0.10)mM]与稳态运动[1.65 (0.09)mM]相似,但75% VO2max时GXT血乳酸值[2.58 (0.21)mM]低于稳态运动15 min后的[4.65 (0.46)mM]。与75% VO2max相比,50%的运动脂肪氧化量更大。久坐不动的肥胖女性和正常体重女性在休息时或在相同相对强度的稳定状态运动中,对底物的使用没有差异。与高强度(75% VO2max)运动相比,低强度(50% VO2max)运动时总脂肪氧化更大。GXT的数据不能用于预测R或底物利用率值,以用于运动处方。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Substrate utilization during submaximal exercise in obese and normal-weight women.

In this study we compared substrate use at submaximal intensities of a maximal graded exercise test (GXT) with that derived from equivalent intensities during continuous submaximal steady-state exercise in obese and normal-weight women. Sedentary obese (n = 20, body fat > 30%) and normal-weight (n = 15, body fat < or =30%) women performed three treadmill tests with concurrent metabolic measurements. Maximal oxygen consumption (VO2max) was determined using the Bruce protocol, followed by two, randomly assigned, continuous 15-min, steady-state exercise bouts, on different days; one bout at 50% and one bout at 75% VO2max. Analysis of variance revealed no significant differences between groups for blood lactate or respiratory exchange ratio (R) values at any point during exercise. Therefore, obese and normal-weight group data were combined for subsequent analyses. The R at 50% VO2max from the GXT [0.83 (0.01)] was significantly (P < 0.05) lower than at 8 min [0.90 (0.01)] and 15 min [0.89 (0.01)] of steady-state exercise, whereas at 75% VO2max, the GXT R [0.96 (0.01)] was similar to that seen at 8 min [0.96 (0.01)] and at 15 min of steady-state exercise [0.93 (0.01)]. Blood lactate values at 50% VO2max were similar between the GXT [1.66 (0.10) mM] and steady-state exercise [1.65 (0.09) mM], but at 75% VO2max the GXT blood lactate values [2.58 (0.21) mM] were lower than after 15 min of steady-state exercise [4.65 (0.46) mM]. Total exercise fat oxidation was greater at 50% compared to 75% VO2max. There was no difference in substrate use between sedentary obese and normal-weight women either at rest or during steady-state exercise at the same relative intensity. Total fat oxidation was greater during low- (50% VO2max) compared to high-intensity (75% VO2max) exercise. Data from a GXT cannot be used to predict R or substrate utilization values for the purpose of exercise prescription.

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