Kang J, Hoffman J R, Chaloupka E C, Ratamess N A, Weiser P C
Human Performance Laboratory, Department of Health and Exercise Science, The College of New Jersey, Ewing, NJ 08628, USA.
J Sports Med Phys Fitness. 2006 Mar;46(1):71-8.
The present investigation was undertaken to elucidate the differences in the progression of metabolic responses during incremental exercise between men and women of similar maximal aerobic capacity.
Twenty males and 20 females served as subjects for the study. Each subject was randomly assigned to perform a graded exercise test on either a cycle ergometer or a treadmill. Of the 20 subjects within each gender, 10 were tested on the cycle ergometer, whereas the other half was tested on the treadmill. During each test, absolute VO2, relative VO2, and HR were recorded during the last 15 seconds of every minute throughout the test. These variables were then plotted separately as a function of work rate so that a best-fit linear regression equation was generated for each of the three plots.
Under the cycle condition, we found no difference in slope of increment in absolute VO2 between genders. However, the slope of increment in relative VO2 and HR was greater (P<0.05) in women than men. A negative correlation (r=-0.858, P<0.05) was found between body mass and slope of increment in relative VO2 in men and women combined. Under the treadmill condition, the slope for absolute VO2 were greater (P<0.05) in men than women. However, in terms of relative VO2 and HR, no between-gender differences were observed in the slope of increment. A positive correlation (r=0.769, P<0.05) was found between body mass and slope of increment in absolute VO2 in men and women combined.
These results indicate that the progression of metabolic responses during incremental exercise differs between men and women despite a similar fitness. These gender differences may be further attributed to body mass that seems to play a distinctive role when the incremental exercise is conducted on a cycle ergometer and treadmill.
本研究旨在阐明最大有氧能力相似的男性和女性在递增运动过程中代谢反应进展的差异。
20名男性和20名女性作为研究对象。每个受试者被随机分配在自行车测力计或跑步机上进行分级运动测试。在每个性别组的20名受试者中，10名在自行车测力计上进行测试，另一半在跑步机上进行测试。在每次测试期间，在测试全程每分钟的最后15秒记录绝对摄氧量、相对摄氧量和心率。然后将这些变量分别作为工作率的函数进行绘制，以便为三个图中的每一个生成最佳拟合线性回归方程。
在自行车条件下，我们发现性别之间绝对摄氧量增加的斜率没有差异。然而，女性相对摄氧量和心率增加的斜率大于男性（P<0.05）。在男性和女性中，体重与相对摄氧量增加的斜率之间存在负相关（r=-0.858，P<0.05）。在跑步机条件下，男性绝对摄氧量的斜率大于女性（P<0.05）。然而，就相对摄氧量和心率而言，未观察到性别之间增加斜率的差异。在男性和女性中，体重与绝对摄氧量增加的斜率之间存在正相关（r=0.769，P<0.05）。
这些结果表明，尽管健康状况相似，但男性和女性在递增运动过程中的代谢反应进展不同。这些性别差异可能进一步归因于体重，当在自行车测力计和跑步机上进行递增运动时，体重似乎起着独特的作用。
