Chester Step Test를 통한 유산소 능력 추정치의 타당성과 신뢰성 검증

초록

The purpose of this study was to verify the validity and reliability of the Chester Step Test(CST), a sub-maximal test for the prediction of aerobic capacity, when compared to maximal oxygen consumption(VO2max) measured during a treadmill test. All participants completed VO2max treadmill test and on separate days, all of subjects completed the CST on two occasions(CST1 & CST2). Subjects were divided by two groups based on their VO2max level(High aerobic capacity Group; age; 21.2±2.45 yrs, Height; 176.6±1.12 cm, Weight; 74.5±2.34 kg, VO2max; 53.2±4.65 ml/kg/min; Low aerobic capacity Group; age; 21.5±3.88 yrs, Height; 176.8±2.45 cm, Weight; 78.4±4.77 kg, VO2max; 40.4±6.77 ml/kg/min). During CST, subjects were required to step on to and a off 30 cm step at a rate set by the metronome beat on a audio cassette. The initial step rate was 15 steps per minute and every 2 minutes the tempo increased by 5 steps per minutes. The subject continued stepping until he reached 80% of their maximum predicted heart rate, or reported a rating of perceived exertion of 15 on the Borg scale, or reached the end of 10-minutes 5 stage test. There was a more higher correlation(r=0.805, p<.0001) between actual VO2max and CST in the low aerobic capacity group than high aerobic capacity group(r=0.634, p<.001). The test-retest repeatability of CST was showed to be good(Chonbach α =0.92). In conclusion, the reliability of the CST as a field based test to detect improvements in aerobic fitness might be recommended. However, validity of CST to predict an actual VO2max is questionable in the high level of aerobic capacity group. Futhermore, it is unclear whether or not the current results are applicable to three other recommended step heights.

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