Adapting the Leger 20 Metre Shuttle Run to a Submaximal Protocol to Predict Peak VO2
University of Regina (Canada), 2007 - 89 pages
The direct assessment of peak aerobic power (V˙O 2peak) is the criterion measure of cardiorespiratory fitness. The Leger 20 metre shuttle run test (LST) is an aerobic power field test in which participants' V˙ O2peak can be predicted reliably by completing a series of consecutive 20 meter shuttle runs at incremental speeds. The LST has been found to be a reliable and valid predictor of maximal aerobic power when correlated with the measure of V˙O2peak attained using indirect calorimetry (Leger, Mercier, Gadoury, & Lambert, 1988; Leger & Gadoury, 1989). This study investigated the feasibility of using submaximal heart rate (HR) responses to the LST to predict V˙O 2peak. The purpose of this study was (1) to compare the V˙ O2peak predicted from the LST with measured V˙O 2peak in healthy subjects, and (2) to develop prediction equations for V˙O2peak using heart rate responses to submaximal intensities from the LST. Seventeen female (mean age +/- SD; 21 +/- 3 yrs) and 17 male subjects (23 +/- 2 yrs) completed a ramped maximal exercise treadmill test (RT), a graded maximal treadmill test (GT), and the LST with a minimum of two days rest between testing sessions. Both the RT and LST involved increases in speed every minute (i.e., stage). The GT was used to validate V˙O2peak from the RT. V˙ O2peak was determined during the RT and GT with metabolic gas analysis. The V˙O2peak from the LST was estimated from the prediction equations developed by Leger et al. (1988), Leger and Gadoury (1989), and Stickland, Petersen, and Bouffard (2003). Data were analyzed using multiple regression and repeated measures ANOVA. Statistical significance was determined when p 0.05. The LST stages completed were 7.5 +/- 1.5 for females and 10 +/- 2.3 for males. Throughout exercise and at peak, no statistically significant differences in heart rate were found between the RT and LST (p 0.05). Peak V˙O2 from the RT was similar to the GT for both males and females (p 0.01). The regression equation from Leger et al. (1988) under-predicted V˙O 2peak in males and over-predicted V˙O2peak in females (p
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