本研究旨在分析登階運動後不同恢復心跳數對評估有氧適能的效度。以31名男性大學生為受試對象，平均年齡19.77±1.20歲、身高173.31±6.26公分、體重64.34±8.91公斤、最大攝氧量(VO2max)47.08±3.39 ml•kg^(-1)•Min^(-1)。所有受試者依平衡次序進行一次最大努力運動測驗與三次不同負荷登階測驗，登階負荷分別為登階高度30、35和40公分配合24次／分的登階頻率，依登階運動後三種不同恢復期評估參數進行分析，包括恢復期5-20秒(PHR15)、60秒(PHR60)兩項恢復心跳數與恢復期1分至1分30秒、2分至2分30秒與3分至3分30秒恢復心跳數核算獲得之心肺耐力指數等評估參數為研究變項。以最大努力運動測驗所得VO2max為有氧適能水準的指標，透過積差相關法分析不同負荷登階測驗後，不同恢復期心跳數及心肺耐力指數分別與VO2max之相關；以直線迴歸分析不同恢復期心跳數與心肺耐力指數評估有氧適能效度，所有統計值的顯著水準訂為α= .05。統計結果發現以登階高度40公分配合登階頻率24次／分的組合進行測驗，依恢復心跳數核算之心肺耐力指數擁有最佳預測有氧適能的效度(r=.50, p<.05)與較小的誤差(SEE=2.94 ml•min^(-1)•Kg^(-1))。因此，針對男性大學生族群，以登階高度40公分和登階頻率24次／分進行登階測驗，其所獲得的心肺耐力指數是為評估有氧適能的最佳參數。

The purpose of this study was to evaluate the accuracy of three postexercise heart rate parameters from 3-min step test to estimate VO2max. Thirty-one college male subjects (M±SD=19.77±1.20 years; 173.31±6.62 cm; 64.34±8.91 kg) had VO2max (M±SD=47.08±3.39 ml•kg^(-1)•Min^(-1)) measured by Bruce treadmill test. Subjects performed three step tests (24 ascents/min) with stepping height were 30, 35, and 40 cm, respectively. Direct measurements of VO2max obtained from the treadmill test were correlated with 5 to 20-sec postexercise heart rate (PHR15), 60-sec postexercise heart rate (PHR60), and Cardiorespiratory Endurance Index (CEI) calculated after three different step test protocols. Linear regression analysis used to determine the estimate VO2max deviated from the measured VO2max. An alpha level of .05 was selected. Results indicated the CEI from performing 3-min step test with 40 cm of stepping height and 24 ascents/min of stepping cadences was seemed to be a more effective (r=.50) and lower standard error of estimates (SEE=2.94 ml•kg^(-1)•Min^(-1)), which was practical field test to estimate the aerobic fitness of college males.