本研究之目的在探討4.0mmol.L-1乳酸閾值(OBLA)、個體無氧闢值(IAT)、對數轉按法(1ρg[La-]-LogV02)及最大距離點(Dmax)法等不同乳酸 閩值判斷方法，在相同運動負荷模式下其測量值闊的差異及相關程度，並封上述四種乳酸閥值的外在放度進行比較。本研究受試者為8名體育系男生，平均年齡20.8±1.1歲，身高171.6±3.2公分，體重64.8±4.3公斤。所有受試者需接受一次漸增強度(25W﹒4min-1)的踏車運動負荷模式至衰竭及二次12分 鐘跑測驗。血樣是採自肘前靜脈，並以全血進行乳酸濃度分析。本文以單因子變異數分析比較四種乳酸闕值間的差異，以線性回歸方注考驗四種乳酸閩值問及其與12分鐘跑成績之間的相關性，得到以下結果:一、四種乳酸閾值測定法判定之闢值耗氧量，以OBLA最高(43.63+5.06m1•kg-I ﹒min-I)，其次是Dmax及IAT(36.91+ 3.18 ; 36.19±8.34) ，而Log-Log為最低(27.46±5.12m1 •kg-I. min-I) ，且除了Dmax與IAT外，其餘各組皆達顯著差異水準(P<.05)。二、四種乳酸閾值測定法判定之閣值耗氧量，其各組相關係數在0.69-0.89之間，皆達P<.05顯著水準。三、最大耗氧量與12分鐘跑成績相關係數鳥0.67，而四種乳酸闕值與12分鐘跑成績相關係數介於0.67-0.90之間，其中，除Log-Log乳酸闕外，其餘三項闕值與12分鐘跑成績的相關係數均高於最大耗氧量。

The purpose of this study was to investigate the differences and relationship between onset of blood lactate accumulation (OBLA)、individual anaerobic threshold (IAT)、log-log transformation and maximal distance method (Dmax) for exercise test of gradual increasing load (25W.4min-1)， and compare their external validity.The subjects were 8 male college students from the department of the physical education， age of 20.8 ± 1.1years， height of 171.6±3.2 cm， weight of 64.8±4.3 kg. Allsubjects participated one exhaustive cycle test and 2 twelve-minute run-walk tests. Blood samples were taken from antecubital vein at the end of each stage， and at 1， 2，5， 10 and 15 mins in the post-exercise period.
This study uses the one-factor analysis of variance to analyze the differences between OBLA，IAT， Log-Log and Dmax， uses the linear regression to compare the relationship， between 12-minute run-walk. Theresults are as follows: 1. The Y02(m1.kg-1，min-1) of OBLA、IAT、Dmax and Log-Log were 43.63±5.06， 36.18±8.34，36.91±3.18 and 27.46±5.12 respectively. Except for Dmax and IAT， significantly different V02 were found among different lactate threshold (LT) values. 2. The correlation coefficients among different LTs ranged from 0.69 to 0.89 reached P <.05 prominently. 3. Thecorrelation coefficents of the V02max and 12-minute run- walk are 0.67， and those of the four kinds of lactate threshold and 12-minute run-walk are between 0.67- 0.90. Except log-log transformation， the correlation coefficients of the rest three items and 12-minute run-walk are above the V02max.