The Study Of Exercise Test Of Physiological Load For Freestyle Middle Distance Male Athletes Of The National Swimming Team

There are several kinds of exercise test of physiological load,between them,the multistage increasing load test is the most accurate and reliable one,by which many parameters and the individual lactic acid threshold could be obtained.But this method is time-consuming and complicated,so that many athletes are not willing to using.In order to selecting some easier and more feasible methods,we carried on 5×200 meters increasing load test,2×400 meters increasing load test,as well as 2000 meters test by eight subjects(outstanding freestyle middle distance male athletes of the national swimming team).Result:the swimming velocity at 4mmol/L lactic acid of 2×400 meters increasing load test is lower than the swimming velocity at individual lactic acid threshold(P＜0.05).But no significant difference was found between swimming velocity at 4.5mmol/L lactic acid and swimming velocity at individual lactic acid threshold(P＞0.05).There is high relevance among lactic acid threshold swimming velocity,the heart rate and the lactic acid of the two tests(P＜0.01).The average swimming velocity of 2000 meters tests is lower than the swimming velocity at individual lactic acid threshold.There is high relevance among the swimming velocity,the heart rate,the lactic acid and RPE of the two tests, Conclusion:To predict the swimming velocity at lactic acid threshold by 2×400 meters increasing load test for Middle distance freestyle athlete of national swimming team may use the swimming velocity at 4.5mmol/L lactic acid.The average swimming velocity of 2000 meters test can transform to swimming velocity at lactic acid threshold by the regression equation:Y＝1.1879X－0.2242(in this equation Y is velocity of individual lactic acid threshold which multistage load tests obtain, X is 2000 meters test swimming velocity).