Beneke R, von Duvillard S P
Department of Sports Medicine, Free University Berlin, Germany.
Med Sci Sports Exerc. 1996 Feb;28(2):241-6. doi: 10.1097/00005768-199602000-00013.
Maximal lactate steady state (MLSS) refers to the upper limit of blood lactate concentration indicating an equilibrium between lactate production and lactate elimination during constant workload. The aim of the present study was to investigate whether different levels of MLSS may explain different blood lactate concentration (BLC) levels at submaximal workload in the sports events of rowing, cycling, and speed skating. Eleven rowers (mean +/- SD, age 20.1 +/- 1.5 yr, height 188.7 +/- 6.2 cm, weight 82.7 +/- 8.0 kg), 16 cyclists and triathletes (age 23.6 +/- 3.0 yr, height 181.4 +/- 5.6 cm, weight 72.5 +/- 6.2 kg), and 6 speed skaters (age 23.3 +/- 6.6 yr, height 179.5 +/- 7.5 cm, weight 73.2 +/- 5.6 kg) performed an incremental load test to determine maximal workload and several submaximal 30-min constant workloads for MLSS measurement on a rowing ergometer, a cycle ergometer, and on a speed-skating track. Maximal workload was higher (P < or = 0.05) in rowing (416.8 +/- 46.2 W) than in cling (358.6 +/- 34.4 W) and speed skating (383.5 +/- 40.9 W). The level of MLSS differed (P < or = 0.001) in rowing (3.1 +/- 0.5 mmol.l-1), cycling (5.4 +/- 1.0 mmol.l-1), and in speed skating (6.6 +/- 0.9 mmol.l-1). MLSS workload was higher (P < or = 0.05) in rowing (316.2 +/- 29.9 W) and speed skating (300.5 +/- 43.8 W) than in cycling (257.8 +/- 34.6 W). No differences (P > 0.05) in MLSS workload were found between speed skating and rowing. MLSS workload intensity as related to maximal workload was independent (P > 0.05) of the sports event: 76.2% +/- 5.7% in rowing, 71.8% +/- 4.1% in cycling, and 78.1% +/- 4.4% in speed skating. Changes in MLSS do not respond with MLSS workload, the MLSS workload intensity, or with the metabolic profile of the sports event. The observed differences in MLSS and MLSS workload may correspond to the sport-specific mass of working muscle.
最大乳酸稳态（MLSS）是指血乳酸浓度的上限，它表明在恒定负荷运动期间乳酸生成与消除之间的平衡。本研究的目的是调查在赛艇、自行车和速度滑冰运动中，不同水平的最大乳酸稳态是否可以解释次最大负荷运动时不同的血乳酸浓度（BLC）水平。11名赛艇运动员（平均±标准差，年龄20.1±1.5岁，身高188.7±6.2厘米，体重82.7±8.0千克）、16名自行车运动员和铁人三项运动员（年龄23.6±3.0岁，身高181.4±5.6厘米，体重72.5±6.2千克）以及6名速度滑冰运动员（年龄23.3±6.6岁，身高179.5±7.5厘米，体重73.2±5.6千克）分别在赛艇测功仪、自行车测功仪和速度滑冰跑道上进行递增负荷测试，以确定最大负荷以及几个用于测量最大乳酸稳态的30分钟次最大恒定负荷。赛艇运动的最大负荷（416.8±46.2瓦）高于自行车运动（358.6±34.4瓦）和速度滑冰运动（383.5±40.9瓦）（P≤0.05）。赛艇运动（3.1±0.5毫摩尔/升）、自行车运动（5.4±1.0毫摩尔/升）和速度滑冰运动（6.6±0.9毫摩尔/升）的最大乳酸稳态水平存在差异（P≤0.001）。赛艇运动（316.2±29.9瓦）和速度滑冰运动（300.5±43.8瓦）的最大乳酸稳态负荷高于自行车运动（257.8±34.6瓦）（P≤0.05）。速度滑冰和赛艇运动之间的最大乳酸稳态负荷没有差异（P>0.05）。与最大负荷相关的最大乳酸稳态负荷强度与运动项目无关（P>0.05）：赛艇运动为76.2%±5.7%，自行车运动为71.8%±4.1%，速度滑冰运动为78.1%±4.4%。最大乳酸稳态的变化与最大乳酸稳态负荷、最大乳酸稳态负荷强度或运动项目的代谢特征无关。观察到的最大乳酸稳态和最大乳酸稳态负荷的差异可能与运动项目特定的工作肌肉质量有关。
