The effects of warming-up on the blood lactate kinetics during exercise / 体力科学

ABSTRACT

The present investigation was designed to examine the effects of warming-up (W-up) on the blood lactate kinetics during 5 minutes of pedaling exercise. Five healthy male adults were the subjects. The intencity of the criterion task (CT) was about 80% VO<SUB>2</SUB>max, and that of the W-up was a work load corresponding to the anaerobic threshold. Between W-up and CT there were five-minute rest periods on the bicycle ergometer. In order to determine the blood lactate values, blood samples were taken from the antecubital vein at the following times rest, pre-CT, and 3, 5, 7, and 30-minutes after CT. Expired gas was analysed continuously for the calculation of VO<SUB>2</SUB>, VCO<SUB>2</SUB>, R, VE. The heart rate was recorded every min-ute from ECG.<BR>Blood lactate values increased 3.23±0.91 mmol/<I>l</I> after W-up, a significant increase over the resting values. The peak blood lactate during the W-up experiment (4.62±0.84 mmol/<I>l</I>) was significantly lower than that of the control experiment (6.48±1.69 mmol/<I>l</I>) . Differences in lactate before and after CT (&Delta;La) was found to be significantly lower in experiments with W-up (1.39±0.99 mmol/<I>l</I>) as compared with control experiments (5.37±1.62 mmol/<I>l</I>) . In one subject, the blood lactate levels decreased during CT after W-up, while lactate levels increased during CT without W-up. VO<SUB>2</SUB> during CT were very similar in both experiments. These results indicate that this kind of W-up delays the rate of blood lactate accumulation during CT.