Hoogeveen A R, Hoogsteen J, Schep G
St. Joseph Hospital Veldhoven, The Netherlands.
Jpn J Physiol. 1997 Oct;47(5):481-5. doi: 10.2170/jjphysiol.47.481.
The upper limit of blood lactate resulting in a lactate steady state during prolonged exercise is called the maximal lactate steady state (MLSS). The purpose of this study was to investigate the lactate response to steady-state exercise during a field test in elite endurance athletes. Plasma lactate levels were assessed in 13 elite triathletes and 13 elite cyclists (mean +/- SD; age 23.7 +/- 5.1 yr; HT 180.2 +/- 6.3 cm; WT 70.3 +/- 5.9 kg; VO2 max 68 +/- 3.7 ml/min/kg) during a 40 km-long time trial on a bicycle (4 km course x 10 laps). The steady state was demonstrated by monitoring the heart rate and timing every course run. The lactate levels were expected to correspond to MLSS. The mean level of lactate during the time trial was 7.4 +/- 2.5 mmol/l. Five athletes maintained plasma lactate levels which exceeded 10 mmol/l or more for almost 1 h. The large value of individual variability was conspicuous (range 3.2-12.2 mmol/l). These values exceeded all previous reported levels for MLSS from other investigators. Our observations are important in sport medical practice since the different lactate responses to exercise are used as parameters in training management.
在长时间运动期间导致乳酸稳态的血乳酸上限被称为最大乳酸稳态（MLSS）。本研究的目的是在精英耐力运动员的现场测试中，调查乳酸对稳态运动的反应。在13名精英铁人三项运动员和13名精英自行车运动员（平均值±标准差；年龄23.7±5.1岁；身高180.2±6.3厘米；体重70.3±5.9千克；最大摄氧量68±3.7毫升/分钟/千克）进行40公里自行车计时赛（4公里赛道×10圈）期间，评估血浆乳酸水平。通过监测心率和记录每一圈的时间来证明达到稳态。预期乳酸水平与最大乳酸稳态相对应。计时赛期间的平均乳酸水平为7.4±2.5毫摩尔/升。五名运动员的血浆乳酸水平在近1小时内维持在超过10毫摩尔/升或更高。个体差异值很大（范围为3.2 - 12.2毫摩尔/升）。这些值超过了其他研究者之前报道的所有最大乳酸稳态水平。我们的观察结果在运动医学实践中很重要，因为运动时不同的乳酸反应被用作训练管理的参数。
