[[alternative]]A study of the PACER test as estimate maximal oxygen uptake and physiological factors

[[abstract]]A laboratory measure of maximal oxygen uptake is generally considered to be the best estimate of aerobic fitness, but this procedure is unsuitable for most school and there are a lot of field test(PACER , distance run) has developed. The purposes of this study were to compare the PACER`s validity with 800/1600m walk/run test and to validate the test-retest reliability of PACER. Sixty subjects completed this study (mean age: 16.28+/-2.68yrs,mean BMI:20.72+/-2.53). Eight subjects were randomize to performed the PACER, 800/1600m walk/run test and maximal exercise test with AeroSport test meter. Pearson`s product-moment correlation was used to compare the concurrent validity of PACER test to 800/1600m walk/run test, and the equation for predicting VO2max was also developed. Intraclass coefficient with one-way ANOVA model was used to determine the test-retest reliability of the PACER . The results revealed that: (1) Concurrent validity of PACER was higher than the 800/1600m walk/run test.(junior-male and junior-female: r = .71 & .77 ,p<.05; senior-male and senior-female: r = .82 & .77, p<.05 respectively). (2) Test-retest reliability of the PACER was:(r = .72, p<.05). (3) Minute ventilation and maximal heart rate was significantly different.(4) According to stepwise regression equation of predicting VO2max (criterion, ml·kg-1·min-1) from the PACER (predictors, laps) was: junior subjects`s VO2max = 0.473X1 - 1.470X2 + 38.185 ( X1=laps X2=years ), senior subjects`s VO2max = 0.469X1 + 1.387X2 – 5.50. It is concluded that using PACER test estimate cardiorespiratory endurance is as valid as 800/1600m walk/run test for junior/senior high school students.