Held T, Marti B
Institute of Sport Sciences, Swiss Sports School, Magglingen.
Int J Sports Med. 1999 Jan;20(1):34-9. doi: 10.1055/s-2007-971088.
Capillary blood lactate assessment is increasingly used by well-trained runners to monitor the intensity of endurance exercise. In order to examine the known association of exercise intensity with blood lactate accumulation also in less trained subjects, we analysed data from a standardized incremental maximal test on the treadmill of 319 men (age 22.9 +/- 5.5 years, [means +/- S.D.]) and 145 women (22.7 +/- 4.5 years) characterized by a wide variation in endurance capacity. Results showed that the running velocity eliciting a blood lactate concentration of 4 mmol/l did not correspond to the same exercise intensity in well endurance-trained vs poorly endurance-trained subjects. At 4 mmol/l blood lactate, the slowest decile of men (i.e. 32 out of 319) ran at 71 +/- 4.7% (corresponding to 2.9 +/- 0.3 m/s) of their maximal treadmill velocity attained during the test (4.1 +/- 0.4 m/s), indicating a rating of perceived exertion (RPE) of 12.3 +/- 1.8 points (Borg scale, range 6-20 points), while the fastest decile of men (n = 32) ran at 91 +/- 3.1% (corresponding to 5.4 +/- 0.2 m/s) of their maximal treadmill speed (5.9 +/- 0.2 m/s), indicating a RPE of 16.6 +/- 1.1 points. Very similar results were observed in women. There was a highly significant, positive correlation between running speed eliciting a blood lactate concentration of 4 mmol/l and RPE when running at this speed, with r = 0.64 in men and r = 0.55 in women. At the same proportional level of maximal running velocity, poorly endurance-trained athletes showed a 2-3 mmol/l higher capillary lactate concentration than well endurance-trained athletes, with both groups indicating the same RPE. These results suggest that fixed blood lactate concentrations not at all mean the same exercise intensity for well vs poorly endurance-trained subjects; this systemic trend should be considered when using blood lactate assessment for individual exercise counselling.
训练有素的跑步者越来越多地使用毛细血管血乳酸评估来监测耐力运动的强度。为了研究在训练较少的受试者中运动强度与血乳酸积累之间已知的关联，我们分析了319名男性（年龄22.9±5.5岁，[均值±标准差]）和145名女性（22.7±4.5岁）在跑步机上进行的标准化递增最大测试的数据，这些受试者的耐力能力差异很大。结果表明，在耐力训练良好的受试者与耐力训练较差的受试者中，引起血乳酸浓度为4 mmol/l的跑步速度并不对应相同的运动强度。在血乳酸浓度为4 mmol/l时，男性中最慢的十分位数（即319人中的32人）以其在测试期间达到的最大跑步机速度（4.1±0.4 m/s）的71±4.7%（相当于2.9±0.3 m/s）跑步，表明自觉用力程度（RPE）为12.3±1.8分（Borg量表，范围6 - 20分），而男性中最快的十分位数（n = 32）以其最大跑步机速度（5.9±0.2 m/s）的91±3.1%（相当于5.4±0.2 m/s）跑步，表明RPE为16.6±1.1分。在女性中观察到非常相似的结果。引起血乳酸浓度为4 mmol/l的跑步速度与以该速度跑步时的RPE之间存在高度显著的正相关，男性中r = 0.64，女性中r = 0.55。在相同比例的最大跑步速度水平下，耐力训练较差的运动员的毛细血管乳酸浓度比耐力训练良好的运动员高2 - 3 mmol/l，两组的RPE相同。这些结果表明，对于耐力训练良好与耐力训练较差的受试者，固定的血乳酸浓度根本不意味着相同的运动强度；在使用血乳酸评估进行个体运动咨询时应考虑这种系统性趋势。
