A STUDY OF EFFECTS OF ENHANCEMENT IN BLOOD LACTATE REMOVAL CAPACITY ON IMPROVEMENT IN ENDURANCE PERFORMANCE

耐力训练(ET)的男性被认为在运动过程中具有优越的清除血液和肌肉中乳酸的能力。然而，耐力训练如何提高ET男性的乳酸清除能力尚不清楚。第一项研究的目的是确定耐力训练是否影响恢复运动引起的血乳酸消失，以及乳酸消失是否与运动成绩有关。乳酸消失率的增量变化与训练前至训练后12RD的增量显著相关。我们发现，ET患者运动能力的改善与血乳酸消失率的变化比与Vo_2LT的变化关系更密切。除了耐力训练对血乳酸消失的影响的结果外，本研究的第二个目的是利用跑步机跑的程序刺激长跑项目的比赛速度，以检验血液中乳酸的优越清除能力是否会导致高成绩。作为受试者的长跑运动员由生理机能同质性组和长跑成绩异质性组组成。跑步机速度的绝对值分别为330米/英寸和270米/分。研究发现，高记录长跑运动员组在从高跑到低跑的速度变化过程中，能迅速降低血乳酸，并能在高再跑时再次升高血乳酸。从第一次和第二次研究的结果来看，血液中乳酸的清除能力，即乳酸代谢的处理能力，是长距离高速跑耐力的重要限制因素。

Endurance-trained(ET) men are thought to have superior capability of lactate removal in blood and muscle during exercise. However, it is unclear how endurance training enhances lactate removal capacity in ET men. The purpose of this first study is to determine whether endurance training influences blood lactate disappearance due to recovery exercise, and whether lactate disappearance is related to performance. The DELTA change in the rate of lactate disappearance was significantly correlated to the DELTA increase in 12RD from pre-training to post-training. We found that the improvement in performance was related more closely to the change in blood lactate disappearance than to the change in Vo_2LT in ET men. We speculate that enhanced lactate disappearance is an important factor in endurance capacity in ET men.In addition of the results of the effect of endurance training on blood lactate disappearance, the purpose of second study is to examine whether the superior capabilitiy of lactate removal in blood leads to high performance, using the procedure of the treadmill running stimulated the race pace in long distance events. Distance runners served as subjects are composed of homogeneous group in physiological function but heterogeneous group in distance performance. Treadmill speed is used absolute values of 330 m/in and 270 m/min. We found that the high recorded distance runner group is able to decrease rapidly blood lactate in corresponding to speed change from high to low pace and is able to increase bolld lactate during high re-pace again. This superior response, bloos lactate removal, was related to high endurance performance to run at high re-pace.From results obtained in first and second studies, it is indicted that lactate removal capacity in blood, which represent disposal capacity of lactate metabolism, is an important limiting factor of endurance performance on long destance running of high velocity.