INFLUENCE OF PLASMA-CATECHOLAMINES ON THE LACTATE THRESHOLD DURING GRADED-EXERCISE
INFLUENCE OF PLASMA-CATECHOLAMINES ON THE LACTATE THRESHOLD DURING GRADED-EXERCISE
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DOI：
10.1152/jappl.1989.67.4.1319
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发表时间：
1989-10-01
影响因子：
3.3
通讯作者：
MARSHALL, P
中科院分区：
文献类型：
--
作者：
MAZZEO, RS;MARSHALL, P
本研究探讨了高训练耐力运动员血浆儿茶酚胺、血乳酸阈（TLa）和通气阈（T.ovrhdot.VE）之间的关系。六名竞技自行车运动员和六名越野跑运动员通过两种不同的方式进行了分级运动测试：跑步机跑步和自行车几何。尽管最大耗氧量（.ovrhdot. v2max）在跑步机和自行车运动中没有显著差异(64.6 .+-。1.0和63.5 .+-。0.4 ml O2。公斤.cntdot。（分别为min-1） TLa和t.v ovrhdot. ve都发生在跑步机运行期间相对较早的工作负荷下。跑步者的情况正好相反，TLa和T.ovrhdot.VE出现的百分比比t. ovrhdot要早。与跑步机相比，骑车时的最大摄氧量(60.0 .+-。1.7 vs. 75.0。分别为4.0%,TLa)。无论测试方案或训练状态如何，血浆肾上腺素的变化都以相同的方式转移，并与TLa同时发生（r = 0.97）。虽然t. ovrhdot、ve和TLa的变化存在高相关性（r = 0.86），但这种相关性不如血浆肾上腺素那么强。结果表明，在分级运动试验中血浆肾上腺素的变化与TLa之间存在因果关系。这种关联在T.ovrhdot.VE和TLa中没有那么强。
This investigation examined the relationship among plasma catecholamines, the blood lactate threshold (TLa), and the ventilatory threshold (T.ovrhdot.VE) in highly trained endurance athletes. Six competitive cyclists and six varsity cross-country runners performed a graded exercise test via two different modalites: treadmill running and bicycle ergometry. Although maximal oxygen consumption (.ovrhdot.V2max) did not differ significantly for the cyclists for treadmill running and cycling (64.6 .+-. 1.0 and 63.5 .+-. 0.4 ml O2 .cntdot. kg-1 .cntdot. min-1, respectively) both TLa and T.ovrhdot.VE occurred at a relatively earlier work load during the treadmill run. The opposite was true for the runners as TLa and T.ovrhdot.VE appeared at an earlier percent of .ovrhdot.VO2max during cycling compared with treadmill running (60.0 .+-. 1.7 vs. 75.0 .+-. 4.0%, respectively, TLa). The inflection in plasma epinephrine shifted in an identical manner and occurred simultaneously with that of TLa (r = 0.97) regardless of the testing protocol or training status. Although a high correlation (r = 0.86) existed for the shift in T.ovrhdot.VE and TLa, this relationship was not as strong as was seen with plasma epinephrine. The results suggest that a casual relationship existed between the inflection in plasma epinephrine and TLa during a graded exercise test. This association was not as strong for T.ovrhdot.VE and TLa.