McInnis K J, Balady G J
Department of Human Performance and Fitness, University of Massachusetts-Boston, USA.
Res Q Exerc Sport. 1999 Jun;70(2):150-6. doi: 10.1080/02701367.1999.10608032.
Oxygen uptake (VO2) during treadmill exercise is directly related to the speed and grade, as well as the participant's body weight. To determine whether body composition also affects VO2 (ml.kg-1.min-1) during exercise, we studied 14 male body builders (M weight = 99 kg, SD = 7; M height = 180 cm, SD = 8; M body fat = 8%, SD = 3; M fat free mass = 91 kg, SD = 7) and 14 weight-matched men (M weight = 99 kg, SD = 9; M height = 179 cm, SD = 5; M body fat = 24%, SD = 5; M fat free mass = 73 kg, SD = 9). Percentage of body fat, t(13) = 8.185, p < .0001, and fat free mass, t(13) = 5.723, p < .0001, were significantly different between groups. VO2 was measured by respiratory gas analysis at rest and during three different submaximal workrates while walking on the treadmill without using the handrails for support. VO2 was significantly greater for the lean, highly muscular men at rest: 5.6 +/- 1 vs. 4.0 +/- 1 ml.kg-1.min-1, F(1, 26) = 21.185, p < .001; Stage 1: 1.7 mph/10%, 18.5 +/- 2 vs. 16.1 +/- 2 ml.kg-1.min-1, F(1, 26) = 6.002, p < .05; Stage 2: 2.5 mph/12%, 26.6 +/- 3 vs. 23.1 +/- 2 ml.kg-1.min-1, F(1, 26) = 7.991, p < .01; and Stage 3:3.4 mph/14%, 39.3 +/- 5 vs. 33.5 +/- 5 ml.kg-1.min-1, F(1, 26) = 7.682, p < .01, body builders versus weight-matched men, respectively. However, net VO2 (i.e., exercise VO2 - rest VO2) was not significantly different between the two groups at any of the matched exercise stages. The findings from this study indicate that VO2 during weight-bearing exercise performed at the same submaximal workrate is higher for male body builders compared to that measured in weight-matched men and that which is predicted by standard equations. These observed differences in exercise VO2 appear to be due to the higher resting VO2 in highly muscular participants.
跑步机运动期间的摄氧量（VO₂）与速度、坡度以及参与者的体重直接相关。为了确定身体成分是否也会影响运动期间的VO₂（毫升·千克⁻¹·分钟⁻¹），我们研究了14名男性健美运动员（平均体重 = 99千克，标准差 = 7；平均身高 = 180厘米，标准差 = 8；平均体脂率 = 8%，标准差 = 3；平均去脂体重 = 91千克，标准差 = 7）和14名体重匹配的男性（平均体重 = 99千克，标准差 = 9；平均身高 = 179厘米，标准差 = 5；平均体脂率 = 24%，标准差 = 5；平均去脂体重 = 73千克，标准差 = 9）。两组之间的体脂百分比，t(13) = 8.185，p <.0001，以及去脂体重，t(13) = 5.723，p <.0001，存在显著差异。通过呼吸气体分析在静息状态以及在跑步机上不使用扶手支撑行走时的三种不同次最大运动强度下测量VO₂。静息时，体型瘦且肌肉发达的男性的VO₂显著更高：5.6 ± 1 对比4.0 ± 1毫升·千克⁻¹·分钟⁻¹，F(1, 26) = 21.185，p <.001；第一阶段：1.7英里/小时/10%坡度，18.5 ± 2对比16.1 ± 2毫升·千克⁻¹·分钟⁻¹，F(1, 26) = 6.002，p <.05；第二阶段：2.5英里/小时/12%坡度，26.6 ± 3对比23.1 ± 2毫升·千克⁻¹·分钟⁻¹，F(1, 26) = 7.991，p <.01；第三阶段：3.4英里/小时/14%坡度，39.3 ± 5对比33.5 ± 5毫升·千克⁻¹·分钟⁻¹，F(1, 26) = 7.682，p <.01，分别为健美运动员与体重匹配的男性。然而，在任何匹配的运动阶段，两组之间的净VO₂（即运动VO₂ - 静息VO₂）均无显著差异。本研究结果表明，在相同次最大运动强度下进行负重运动时，男性健美运动员的VO₂高于体重匹配男性以及标准方程预测的值。这些观察到的运动VO₂差异似乎是由于肌肉发达的参与者静息VO₂较高所致。
