The Method Of Cycle Ergometer Test To Evaluate Cardiorespiratory Function For Middle School Student

Purpose: This study designs cycle ergometer progressively increasing Sub-maximal intensity test which is based on the PWC170test. Calculate the physical work capacity relative body weight valne when the heart rate is160beat/niin(PWC160relative value). This study aims to evaluate the cardiorespiratory function of middle school students by the evaluation criteria established by PWC160relative value.Methods: The subjects are307middle school students(165boys,150girls),we do the maximal cycle ergometer test, step test and the Sub-maximal cycle ergometer test for the same group of person, the VO2max measured on the cycle ergometer is standard. Then analysis the relationship of step index and PWC160relative value with the VO2maxResults:(1) Tlie correlation coefficient of step index and VO2max boys and girls are0.265、0.124;The correlation coefficient of PWC160relative value and VO2max boys and girls areO.762、0.707;The re-test results that the correlation coefficient of twice PWC160relative value is0.831.There was no significant difference(P>0.05).(2) In the Regression equation for boys, R2=0.581. R2c=0.574, SEE=2.81ml/kg·min. The correlation coefficient between VO2maxactual measmed value and predictive value is0.844(P<0.01) in the assessment group. There was no significant difference between them(P>0.05). In the Regression equation for girls, R2=0.5. R2c=0.492. SEE=1.75ml/kg·min. The conelation coefficient between VO2max actual measured value and predictive value is0.835(P>0.01) in the assessment group. There was no significant difference between them(P>0.05).(3) In the evaluation criteria established by PWC160relative value the PWC160relative value distribution ratio in all levels are ideaL The general trend of the relatively VO2max in different levels group is excellent>better>good>commom>poor>very poor. And there was significant difference during the group(P<0.05). The general trend of the PWC160relative value in different body weight group is normal weight>overweight>obesity. Conclusions:(1) The correlation coefficient between PWC160relative value and VO2max is higher than step index. And it is reliable. So it’s good to evaluate the cardiorespiratory for the middle school student.(2) The regression equations of PWC160relative value Speculate VO2max are:for boys: y=22.779+9.256x. for girls: y=4.777+6.679x.(3) In the evaluation criteria established by PWC160relative value, the differentiation is good. The PWC16o relative value is consistent with the VO2max relative value. PWC160relative value is sensitive to obesity. So we can evaluate the cardiorespiratory for middle school students by the evaluation criteria established by PWC160relative value.