Abstract: Objective: This study attempts to investigate the measurement of the validation of cardiorespiratory fitness through 1000 (800)-running test and 20mSRT in order to provide reference for the future development of the test method of evaluating cardiorespiratory fitness of children and adolescents effectively. Method: 61 students (29 males and 32 females) are randomly selected as research objects from middle schools in Shanghai to analyze the relevance of different VO₂max from 1000(800)-meter running test, 20mSRT and treadmill test respectively by using ROC and multiple linear regression analysis. Results and Conclusion: (1)The correlation coefficient of VO₂max from 1000-meter running test (male) and 20mSRT is 0.440 and 0.468 respectively while that of 800-meter running test (female) and 20mSRT is 0.513 and 0.765 respectively. 20mSRT is better than 1000(800)-running test in terms of measuring the cardiorespiratory fitness. (2)Taking the VO₂max from treadmill test as standard, the area under ROC curve from 1000-meter running test (male) and 20mSRT is 0.571 and 0.688 respectively while that of 800-meter running test (female) and 20mSRT is 0.523 and 0.661 respectively.(3)The regression equation between VO₂max and 20mSRT number: VO₂max=115.54356- (1.93803 × age) - (7.13359 x Gender) - (1.86024 x BMI) + (0.065772 x N)(male= 0, female= 1, N=the number of 20mSRT), correlation coefficient equation and the VO₂max is 0.713.

Key words: VO₂max, 20mSRT, 1000 (800)-meter run, treadmill test