Smith Mark F, Balmer James, Coleman Damian A, Bird Steve R, Davison R C Richard
Department of Sport and Exercise Science, Canterbury Christ Church University College, United Kingdom.
Med Sci Sports Exerc. 2002 Nov;34(11):1744-9. doi: 10.1097/00005768-200211000-00009.
The aim of the study was to examine the effects of different lactate elevation protocols on the determination of the lactate minimum (Lac(min)) point.
Eight highly trained racing cyclists each completed four continuous ramp lactate minimum tests using the following blood lactate elevation protocols: 1) continuous ramp maximal aerobic power (RMP(max)) assessment, 2) 30-s maximal sprint, 3) 40-s maximal sprint, and 4) two 20-s maximal sprints separated by a 1-min recovery. Each blood lactate elevation protocol was followed by a 5-min active recovery leading into a continuous ramp test commencing at a power of 60% of RMP(max), using a 6 W x min ramp rate, lasting 15 min.
Peak La values were significantly higher (P > 0.05) after the RMP(max) compared with all other protocols and higher in the 40-s versus 30-s sprint. However, by the start of Lac(min) ramp, La after the RMP(max) was no longer higher than the 40-s sprint, but Lac(min) La was similar for all protocols. This resulted in no differences in the total decline of La measured as a percentage from the highest to the lowest value. At Lac(min) point, there were no significant differences in power (P > 0.05), but heart rate was higher in the RMP versus 2 x 20 s and VO(2) was significantly higher after the 40 s compared with the 2 x 20 s protocol.
This study demonstrated that the determination of lactate minimum power in cycling is not dependent upon the lactate elevation protocol.
本研究旨在探讨不同血乳酸升高方案对乳酸最低点（Lac(min)）测定的影响。
八名训练有素的自行车赛车手每人使用以下血乳酸升高方案完成四次连续递增乳酸最低点测试：1）连续递增最大有氧功率（RMP(max)）评估，2）30秒最大冲刺，3）40秒最大冲刺，4）两次20秒最大冲刺，中间间隔1分钟恢复时间。每次血乳酸升高方案后进行5分钟的主动恢复，然后开始以RMP(max)的60%功率进行连续递增测试，递增速率为6瓦/分钟，持续15分钟。
与所有其他方案相比，RMP(max)后La峰值显著更高（P > 0.05），且40秒冲刺后的La峰值高于30秒冲刺后的。然而，在Lac(min)递增开始时，RMP(max)后的La不再高于40秒冲刺后的，但所有方案的Lac(min)La相似。这导致从最高值到最低值以百分比衡量的La总下降量没有差异。在Lac(min)点，功率没有显著差异（P > 0.05），但RMP方案中的心率高于2×20秒方案，且40秒冲刺后的VO(2)显著高于2×20秒方案。
本研究表明，自行车运动中乳酸最小功率的测定不依赖于血乳酸升高方案。
