Abstract des Autors

Purpose: The purpose of this study was to develop a prediction model based on a submaximal workload during the Bruce treadmill protocol to estimate peak oxygen consumption (VO2peak) in adolescent girls. Method: Adolescent girls (N = 116, Mage = 13.2 +/- 2.0 years) performed a Bruce Treadmill Test to exhaustion. Expired respiratory gases and heart rate (HR) were collected and measured continuously via indirect calorimetry and telemetry. To be included in the analysis, each participant met 2 of 3 criteria: attain 95 percent of age-predicted HRpeak, respiratory exchange ratio>1.05, or plateau of VO2. VO2 and HR at Stage 1 and Stage 2 of the Bruce test were entered into a regression model to predict VO2peak. Results: A regression model, constructed using the predicted sum of squares statistic, was developed using VO2 (VO22) and HR (HR2) attained at the 2nd 3-min stage of the Bruce treadmill protocol: VO2peak = 46.77 - (0.2854155 × HR2) +(1.46732912 × VO22). Actual average ( +/- SD) VO2peak was 36.2 +/- 6.9 ml/kg/min (range = 22.9-55.9). Predicted VO2peak was 36.2 +/- 5.5 ml/kg/min (range = 24.3-56.2). The correlation between actual and predicted VO2peak was r = .80, standard error of estimate = 4.2 ml/kg/min, with no bias relative to participant aerobic fitness. Conclusion: Based on this model, the VO2peak of healthy adolescent girls can be predicted within 4.2 ml/kg//min using submaximal Bruce data. Verf.-Referat