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极限负荷时运动持续时间和运动水平密切相关。本研究发现运动后睾酮（Ｔ）水平与最大耗氧平台（Ｖ·Ｏ２ｍａｘＰＤ）显著相关，β内啡肽（βＥＰ）分泌水平与最大耗氧量（Ｖ·Ｏ２ｍａｘ），Ｖ·Ｏ２ｍａｘＰＤ显著相关，与呼吸频率负相关显著。提示Ｖ·Ｏ２ｍａｘＰＤ的维系，可能有垂体性腺轴的参与。而βＥＰ对呼吸频率、Ｖ·Ｏ２ｍａｘ及Ｖ·Ｏ２ｍａｘＰＤ的维系也存在着调控作用。Ｖ·Ｏ２ｍａｘＰＤ时心率和通气量较之安静时大辐度增长，间接说明儿茶酚胺在极限负荷时对循环系统的支持
Extreme load duration of exercise and exercise level are closely related. This study found that post-exercise testosterone (T) levels and the maximum oxygen consumption platform (V · O2maxPD) was significantly related to β-endorphin (β EP) secretion level and maximum oxygen consumption (V · O2max), V · O2maxPD significant Related negative correlation with respiratory rate significantly. Tip V · O2maxPD maintenance, there may be pituitary gonadal axis involvement. The β EP on respiratory rate, V · O2max and V · O2maxPD also play a regulatory role. V · O2maxPD when the heart rate and ventilation compared with quiet when the large increase in the radial, indirect description of catecholamines in the limit load of the circulatory system support