Zwiren L D, Cureton K J, Hutchinson P
Int J Sports Med. 1983 Nov;4(4):255-9. doi: 10.1055/s-2008-1026045.
In previous studies comparing circulatory responses to exercise in men and women, the habitual physical activity of the groups was not documented. Thus, it is possible that sex differences observed were partly a function of differences in level of physical condition. The purpose of this study was to compare central circulatory responses to submaximal bicycle ergometer exercise in equally trained men and women. Cardiac output (Q), stroke volume (SV), heart rate (HR), and arteriovenous oxygen content difference [(a-v)O2 diff] were determined at approximately 30%, 50%, 70%, and 90% VO2max in 18 male and 18 female trained young adults. Q was determined by the CO2 -rebreathing method. The men and women had similar training backgrounds and nonsignificantly different mean VO2max in ml . kg FFW-1 . min-1 (62.3 and 60.3, respectively). Mean differences between men and women in Q (0.44 l . min-1), HR (23 bts . min-1), and (a-v)O2 diff at 1.5 l . min-1 and in heart rate at various percentages of VO2max (2-4 bts . min-1) were smaller than in previous research. Smaller sex differences in various VO2max expressions in the present study suggest that there was a difference between males and females in habitual physical activity in earlier research. It is concluded that a portion of previously reported sex differences in certain circulatory responses to submaximal exercise was a consequence of different levels of physical condition of the male and female subjects. The magnitude of gender-related differences in circulatory responses to submaximal exercise appears to be smaller than previously thought.
在以往比较男性和女性运动循环反应的研究中，未记录各研究组的习惯性身体活动情况。因此，观察到的性别差异可能部分是身体状况水平差异的作用结果。本研究的目的是比较经过同等训练的男性和女性在进行次最大强度自行车测力计运动时的中枢循环反应。在18名受过训练的年轻男性和18名受过训练的年轻女性中，分别在约30%、50%、70%和90%最大摄氧量（VO2max）时测定心输出量（Q）、每搏输出量（SV）、心率（HR）和动静脉氧含量差[（a-v）O2 diff]。Q通过二氧化碳重呼吸法测定。男性和女性具有相似的训练背景，以毫升·千克去脂体重-1·分钟-1为单位的平均VO2max无显著差异（分别为62.3和60.3）。男性和女性在Q（0.44升·分钟-1）、HR（23次·分钟-1）以及1.5升·分钟-1时的（a-v）O2 diff和不同VO2max百分比时的心率（2-4次·分钟-1）方面的平均差异小于以往研究。本研究中不同VO2max表现形式下较小的性别差异表明，早期研究中男性和女性在习惯性身体活动方面存在差异。得出的结论是，先前报道的在次最大运动的某些循环反应中的性别差异部分是男性和女性受试者身体状况不同水平的结果。次最大运动的循环反应中与性别相关的差异程度似乎比先前认为的要小。
