Bishop D, Jenkins D G, Mackinnon L T
Department of Human Movement Studies, University of Queensland, Brisbone, Australia.
Med Sci Sports Exerc. 1998 Aug;30(8):1270-5. doi: 10.1097/00005768-199808000-00014.
The relationship between six descriptors of lactate increase, peak VO2, Wpeak, and 1-h cycling performance were compared in 24 trained, female cyclists (peak VO(2) = 48.11 +/- 6.32 mLxkg(-1)xmin(-1).
The six descriptors of lactate increase were: 1) lactate threshold (LT; the power output at which plasma lactate concentration begins to increase above the resting level during an incremental exercise test), 2) LT(1) the power output at which plasma lactate increases by 1 mM or more), 3) LT(D) (the lactate threshold calculated by the D-max method), 4) LT(MOD) (the lactate threshold calculated by a modified D-max method), 5) L4 (the power output at which plasma lactate reaches a concentration of 4 mmolxL(-1), and 6) LT(LOG) (the power output at which plasma lactate concentration begins to increase when the log ([La(-1]) is plotted against the log (power output). Subjects first completed a peak VO(2) test on a cycle ergometer. Finger-tip capillary blood was sampled within 30 s of the end of each 3-min stage for analysis of plasma lactate. Endurance performance was assessed 7 d later using a 1-h cycle test (OHT) in which subjects were directed to achieve the highest possible average power output.
The mean power output (W) for the OHT (+/- SD) was 183.01 +/- 18.88, and for each lactate variable was:LT (138.54 +/- 46.61), LT(1) (179.17 +/- 27.25), LT(log) (143.97 +/- 45.74), L4 (198.09 +/- 33.84), LT(D) (178.79 +/- 24.07), LT(MOD)(212.28 +/- 31.75). Average power output during the OHT was more strongly correlated with all plasma lactate parameters (0.61<r<0.84) and W(peak) (r = 0.81) than with peak VO(2) (r = 0.55). The six lactate parameters were strongly correlated with each other (0.54<r<0.91) and of six lactate parameters, LT(D) correlated best with endurance performance (r = 0.84).
It was concluded that plasma lactate parameters and W(peak) provide better indices of endurance performance than peak VO(2) and that, of the six descriptors of lactate increase measured in this study, LT(D) is most strongly related to 1-h cycling performance in trained, female cyclists.
比较24名受过训练的女性自行车运动员中乳酸增加的六个描述指标、峰值摄氧量（peak VO₂）、峰值功率（Wpeak）与1小时骑行表现之间的关系（峰值摄氧量=48.11±6.32毫升·千克⁻¹·分钟⁻¹）。
乳酸增加的六个描述指标为：1）乳酸阈值（LT；递增运动测试中血浆乳酸浓度开始高于静息水平时的功率输出），2）LT₁（血浆乳酸增加1毫摩尔或更多时的功率输出），3）LT(D)（通过D-max方法计算的乳酸阈值），4）LT(MOD)（通过改良D-max方法计算的乳酸阈值），5）L4（血浆乳酸浓度达到4毫摩尔·升⁻¹时的功率输出），6）LT(LOG)（当将log([La⁻¹])与log(功率输出)作图时，血浆乳酸浓度开始增加时的功率输出）。受试者首先在自行车测力计上完成一次峰值摄氧量测试。在每个3分钟阶段结束后30秒内采集指尖毛细血管血样，用于分析血浆乳酸。7天后使用1小时骑行测试（OHT）评估耐力表现，在该测试中指导受试者达到尽可能高的平均功率输出。
OHT的平均功率输出（瓦特）（±标准差）为183.01±18.88，每个乳酸变量的值为：LT（138.54±46.61），LT₁（179.17±27.25），LT(log)（143.97±45.74），L4（198.09±33.84），LT(D)（178.79±24.07），LT(MOD)（212.28±31.75）。OHT期间的平均功率输出与所有血浆乳酸参数（0.61＜r＜0.84）和W(peak)（r = 0.81）的相关性比与峰值摄氧量（r = 0.55）更强。六个乳酸参数彼此之间相关性很强（0.54＜r＜0.91），在六个乳酸参数中，LT(D)与耐力表现的相关性最佳（r = 0.84）。
得出的结论是，血浆乳酸参数和W(peak)比峰值摄氧量能更好地反映耐力表现，并且在本研究测量的六个乳酸增加描述指标中，LT(D)与受过训练的女性自行车运动员的1小时骑行表现最密切相关。
