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更好的血液和肌肉乳酸清除能力。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会影响恢复性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DELTA变化与12RD从训练前到训练后的DELTA增加显著相关。我们发现，运动成绩的提高与血乳酸消失的变化关系更密切，而与Vo_2LT的变化关系更密切。我们推测，乳酸消失的增强是ET男性耐力能力的重要因素。除了耐力训练对血乳酸消失的影响外，第二项研究的目的是检验在长距离比赛中，使用跑步机跑步的程序刺激比赛配速，血液中乳酸去除能力的优势是否导致高性能。作为实验对象的长跑运动员在生理功能上分为同质组，而在距离表现上分为异质组。跑步机速度使用绝对值330米/英寸和270米/分钟。我们发现高记录长跑运动员组在从高配速到低配速的速度变化中，血乳酸能够迅速下降，而在再次高配速时，血乳酸能够增加。这种优异的反应，血液乳酸去除，与高再配速的高耐力表现有关。从第一和第二项研究的结果可以看出，血液中乳酸的清除能力，即乳酸代谢的处理能力，是限制长距离高速度跑步耐力表现的重要因素。

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.