Plasma catecholamine and blood lactate responses to incremental arm and leg exercise.
Plasma catecholamine and blood lactate responses to incremental arm and leg exercise.
复制标题
血浆儿茶酚胺和血乳酸对增量手臂和腿部运动的反应。
DOI：
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发表时间：
2000
影响因子：
4.1
通讯作者：
Greg C. Gass
中科院分区：
文献类型：
--
作者：
Donald Anthony Schneider;Tom M. McLellan;Greg C. Gass
目的与方法
本研究旨在探讨递增负荷上肢和下肢运动对血浆儿茶酚胺和血乳酸的影响。七个未经训练的男性受试者进行了两个增量运动测试在不同的日子随机顺序。一项测试包括单臂摇动（5 W x 2 min（-1）），而另一项运动测试是双腿骑行（20- 25 W x 2 min（-1））。在单臂摇动期间从非运动臂获得血液样品，在双腿骑自行车期间从同一臂和静脉获得血液样品。在两种运动条件下测定每个受试者的血乳酸（T（La））、肾上腺素（T（Epi））和去甲肾上腺素（T（NE））的临界值，并将其定义为作为功率输出函数绘制的断点。
结果
两种运动方式比较，单臂摇车运动的T（La）、T（Epi）和T（NE）均显著低于双腿蹬车运动（P < 0.01）。单臂摇动期间，T（La）（0.96 +/- 0.10 L x min（-1））、T（Epi）（1.02 +/- 0.07 L x min（-1））和T（NE）（1.07 +/- 0.09 L x min（-1））同时发生。在双腿自行车运动中，T（La）（1.77 +/- 0.20 L x min（-1））、T（Epi）（1.74 +/- 0.17 L x min（-1））和T（NE）（1.98 +/- 0.17 L x min（-1））出现在相似的VO 2水平，无显著差异。在T（La）和T（Epi）测量的VO 2之间观察到的相关性为0.917（手臂）和0.929（腿部运动）（P < 0.001）。在T（La）处获得的肾上腺素浓度（[Epi]）在手臂（0.144 ng x mL（-1））和腿部（0.152 ng x mL（-1））运动中没有显著差异。
结论
血浆[Epi]中的断点以相同的方式移动，并且与T（La）的断点同时发生，而与运动模式（手臂或腿部）无关。在T（La）处观察到的Epi浓度与先前报道的在静息时Epi输注期间产生血乳酸升高的浓度一致。这些结果支持了这样的假设，即血浆[Epi]的升高可能有助于在递增运动期间发生的血乳酸的断点。
PURPOSE AND METHODS
The present study was conducted to examine the pattern of plasma catecholamine and blood lactate responses to incremental arm and leg exercise. Seven untrained male subjects performed two incremental exercise tests on separate days in random order. One test consisted of 1-arm cranking (5W x 2 min(-1)), whereas the other exercise test was 2-leg cycling (20-25W x 2 min(-1)). Blood samples were obtained from the nonexercising arm during 1-arm cranking and from the same arm and vein during 2-leg cycling. Thresholds for blood lactate (T(La)), epinephrine (T(Epi)) and norepinephrine (T(NE)) were determined for each subject under both exercise conditions and defined as breakpoints when plotted as a function of power output.
RESULTS
When the two modes of exercise were compared, T(La), T(Epi), and T(NE) were all significantly lower for 1-arm cranking than for 2-leg cycling (P < 0.01). During 1-arm cranking, T(La) (0.96 +/- 0.10 L x min(-1)), T(Epi) (1.02 +/- 0.07 L x min(-1)), and T(NE) (1.07 +/- 0.09 L x min(-1)) occurred simultaneously. During 2-leg cycling, T(La) (1.77 +/- 0.20 L x min(-1)), T(Epi) (1.74 +/- 0.17 L x min(-1)), and T(NE) (1.98 +/- 0.17 L x min(-1)) occurred at similar levels of VO2 and were not significantly different. The correlation observed between the VO2 measured at the T(La) and T(Epi) was 0.917 for arm and 0.929 for leg exercise (P < 0.001). The epinephrine concentration ([Epi]) obtained at the T(La) was not significantly different for arm (0.144 ng x mL(-1)) and leg (0.152 ng x mL(-1)) exercise.
CONCLUSIONS
The breakpoint in plasma [Epi] shifted in an identical manner and occurred simultaneously with that of T(La) regardless of the mode of exercise (arm or leg). The Epi concentrations observed at the T(La) agree with those previously reported to produce a rise in blood lactate during Epi infusion at rest. These results support the hypothesis that a rise in plasma [Epi] may contribute to the breakpoint in blood lactate that occurs during incremental exercise.
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影响因子：
20.1
作者：
Blomqvist,CG;Lewis,SF;Taylor,WF;Graham,RM
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DOI：
10.1152/ajpendo.1987.253.3.e322
发表时间：
1987
期刊：
The American journal of physiology
影响因子：
--
作者：
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通讯作者：
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影响因子：
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作者：
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DOI：
10.1152/jappl.1984.57.2.321
发表时间：
1984
期刊：
Journal of applied physiology: respiratory, environmental and exercise physiology
影响因子：
--
作者：
Stainsby,WN;Sumners,C;Andrew,GM
通讯作者：
Andrew,GM