Plasma beta-endorphin responses to one-hour bicycling and running at 60% VO2max.
Plasma beta-endorphin responses to one-hour bicycling and running at 60% VO2max.
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血浆％20β-内啡肽％20反应％20至％20一小时％20骑自行车％20和％20跑步％20at％2060％％20VO2max。
DOI：
10.1249/00005768-198704000-00003
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发表时间：
1987
影响因子：
4.1
通讯作者：
P. Kao
中科院分区：
文献类型：
--
作者：
M. E. Langenfeld;L. S. Hart;P. Kao
研究了10名成年男性志愿者在60%最大摄氧量下骑车和跑步1h对血浆β-内啡肽(B-EN)的影响。所有受试者都进行了体力活动，并习惯于两种运动模式(平均最大摄氧量，单位为mlX kg-1Xmin-1；骑自行车，54；跑步，59)。在初步的最大摄氧量测试之后，受试者参加了随机排序的骑自行车和跑步1小时的实验，负荷要求他们特定模式的最大摄氧量的60%。五名受试者也参加了控制会议。分别于运动前和运动后即刻采集血样，并测定血细胞比容。样品被离心，分离，血浆保存在零下50摄氏度，直到分析B-EN。分析包括用短柱层析和放射免疫分析从β-脂促性素中分离出B-EN。尽管观察到运动后B-en升高的趋势，但在三次运动前和运动后的任何一次中，平均B-en水平都没有显著差异(P>0.05)。以B-EN的百分比变化表示，骑自行车、跑步或对照组之间没有显著差异。这些结果表明，60%最大摄氧量的1h骑自行车或跑步运动不会持续增加B-EN，而且不同个体的反应是不同的。
Ten adult male volunteers were studied to examine the effect on plasma beta-endorphin (B-EN) of bicycling and running for 1 h at 60% VO2max. All subjects were physically active and accustomed to both exercise modes (mean VO2max in ml X kg-1 X min-1; bicycling, 54; running, 59). Following preliminary VO2max tests, subjects participated in randomly ordered experimental sessions of bicycling and running for 1 h at loads requiring 60% of their mode-specific VO2max. Five subjects also participated in control sessions. Blood samples were collected immediately pre- and immediately post-exercise, and hematocrits were determined. Samples were centrifuged, separated, and plasma was stored at -50 degrees C until analysis for B-EN. Analysis involved separation of B-EN from beta-lipotropin by short column chromatography followed by radioimmunoassay. Despite an observed trend for elevated B-EN following exercise, there were no significant pre- to post-exercise differences (P greater than 0.05) in mean B-EN levels in any of the three sessions. Expressed as percentage change in B-EN, there were no significant differences between bicycling, running, or control. These results indicate that 1 h bicycling or running exercise at 60% VO2max does not consistently increase B-EN, and that responses are variable between individuals.