EFFECT OF CIRCULATORY SYSTEM AND BUFFER SYSTEM ON BLOOD LACTATE DISAPPEARANCE IN RECOVERY EXERCISE

耐力训练的男性（ET）在恢复性运动中的血乳酸消失率优于未训练的男性（UT）。本研究旨在明确et中乳酸消失的机制。首先，我们研究了循环系统对血乳酸消失的影响，即心排血量(Q)、搏量（SV）和（a-v） O_2差（a-v O_2 diff）对乳酸消失的影响。其次，我们研究了缓冲系统在HT和UT中对血乳酸清除的作用。ET与UT间血乳酸第一消失率差异有统计学意义（P<0.05）。两组间Q、SV心率（HR）和（a-v） O_2差异无显著性差异。在恢复性运动中，两组之间的VO2差异较大，但差异不显著。VO_2由Q、SV、HR和a-v O_2 diff进行积分。通过各参数的综合差值来总结两组VO_2的显著性差异。我们发现过量VO_2与乳酸消失率显著相关。其次，我们研究了恢复性运动中血乳酸消失与pH恢复的关系。结果表明，尽管在恢复运动中乳酸消失的速度相同，但ET的pH恢复速度比UT更快。pH恢复到乳酸消失的速率，即缓冲能力，在HF中比在UT中表现得更高，我们推测ET具有更强的CO_2从体内向外呼气的能力。在恢复性运动中，缓冲系统比循环系统对血乳酸消失的影响更大。

Edurance trained men (ET) have the superior blood lactate disappearance than untrained men (UT) do in recovery exercise. We start this study to clear the mechanism of lactate disappearance in ET.First, we in vestigated the effect of ciculatory system on blood lactate disappearance, that is, of cardiac output (Q), stroke volume (SV and (a-v) O_2 difference (a-v O_2 diff) on it. Second we studied how buffer system is contributed to blood lactate removal in HT and UT.First Rate of blood lactate disappearance was significantly different between ET and UT (P<0.05). However, Q,SV heart rate (HR) and (a-v) O_2 diff. did not occur significant difference between both groups. SV occurred a few much but not significant difference and there was only a large and significant difference between both groups in VO2 at recovery exercise. VO_2 is integrated by Q,SV HR and a-v O_2 diff.. The significant difference of VO_2 between both groups was summarized by the integrated difference of each parameter. We found excess VO_2 Was Significantly related to rate of lactate disappearance.Second, we studied the relationship of blood lactate disappearance to pH recovery during recovery exercise. It was shown that pH recovery was more rapid in ET than in UT despite of the same rate of lactate disappearance during recovery exercise. Rate of pH recovery to lactate disappearance, that is represented as buffering capacity was shown higher in HF than in UT We speculated that ET have a superior capacity of CO_2 expiration from body to outside.We conclued that buffer system influences to blood lactate disappearance stronger than circulatory system does during recovery exercise.