与未经训练的男性相比，未经训练的女性在递增运动期间血浆乳酸积累减少。

Plasma lactate accumulation is reduced during incremental exercise in untrained women compared with untrained men.

作者信息

Sargent Charli, Scroop Garry C

机构信息

Exercise Physiology Research Unit, Department of Physiology, University of Adelaide, Adelaide, SA, Australia.

出版信息

Eur J Appl Physiol. 2007 Sep;101(1):91-6. doi: 10.1007/s00421-007-0477-9. Epub 2007 May 23.

DOI:10.1007/s00421-007-0477-9

PMID:17520272

Abstract

The lactate threshold (LT) is commonly reported as not different between sexes, yet lower blood lactate concentrations have been reported in women during submaximal exercise. The purpose of the present study was to measure the changes in plasma lactate concentration [La(-1)] in men and women during incremental cycle ergometer exercise using the same protocol and compare the data using several different methods of analysis. A group of untrained men (n = 21) and women (n = 22) were studied and venous blood drawn at regular intervals during and after exercise for assay of plasma [La(-1)]. Plasma [La(-1)] increased during exercise in both sexes, reaching higher values in men, both at exhaustion (men 8.6 +/- 2.3 mmol l(-1); women 6.2 +/- 2.3 mmol l(-1); P = 0.01) and post-exercise (men 11.8 +/- 2.1 mmol l(-1); women 10.2 +/- 2.4 mmol l(-1); P = 0.03). Logarithmic transformation of the data yielded LT values that were not different between sexes (men 44.2 +/- 12.9; women 50.2 +/- 12.6; %VO2peak; P = 0.45), yet both the 2 and 4 mmol l(-1) fixed concentration LT occurred at lower relative intensities in men (2 mmol l(-1): men 50.9 +/- 12.9; women 66.9 +/- 11.1; %VO2peak; P = 0.01). 4 mmol l(-1): men 75.7 +/- 11.0; women 90.6 +/- 9.2; VO2peak; P = 0.01). However, when the plasma [La(-1)] was examined in both sexes throughout exercise, using a single exponential function, plasma [La(-1)] was significantly lower in women (P < 0.05) at all relative intensities between 30 and 100%VO2peak. While the basis of this sex difference is unknown, reduced plasma [La(-1)] during submaximal exercise in women may offset to some degree the endurance performance disadvantage of their lower VO2peak.

摘要

乳酸阈（LT）通常被认为在性别之间没有差异，但有报道称在次最大运动期间女性的血乳酸浓度较低。本研究的目的是使用相同方案测量男性和女性在递增式自行车测力计运动期间血浆乳酸浓度[La⁻¹]的变化，并使用几种不同的分析方法比较数据。研究了一组未经训练的男性（n = 21）和女性（n = 22），在运动期间和运动后定期采集静脉血以测定血浆[La⁻¹]。运动期间两性的血浆[La⁻¹]均升高，在力竭时（男性8.6±2.3 mmol·l⁻¹；女性6.2±2.3 mmol·l⁻¹；P = 0.01）和运动后（男性11.8±2.1 mmol·l⁻¹；女性10.2±2.4 mmol·l⁻¹；P = 0.03）男性达到更高值。对数据进行对数转换后得到的乳酸阈数值在性别之间没有差异（男性44.2±12.9；女性50.2±12.6；%VO₂peak；P = 0.45），然而，2和4 mmol·l⁻¹固定浓度的乳酸阈在男性中出现在较低的相对强度下（2 mmol·l⁻¹：男性50.9±12.9；女性66.9±11.1；%VO₂peak；P = 0.01）。4 mmol·l⁻¹：男性75.7±11.0；女性90.6±9.2；VO₂peak；P = 0.01）。然而，当使用单指数函数在整个运动过程中检查两性的血浆[La⁻¹]时，在30%至100%VO₂peak之间的所有相对强度下，女性的血浆[La⁻¹]均显著较低（P < 0.05）。虽然这种性别差异的原因尚不清楚，但女性在次最大运动期间血浆[La⁻¹]的降低可能在一定程度上抵消了她们较低的VO₂peak所带来的耐力表现劣势。