ABSTRACTThe purposes of the present study were to (a) modify previously published VO2max equations using the constant error (CE = mean difference between actual and predicted VO2max) values from Malek et al. (28); (b) cross-validate the modified equations to determine their accuracy for estimating VO2max in aerobically trained men; (c) derive a new non–exercise-based equation for estimating VO2max in aerobically trained men if the modified equations are not found to be accurate; and (d) cross-validate the new VO2max equation using the predicted residual sum of squares (PRESS) statistic and an independent sample of aerobically trained men. One hundred and fifty-two aerobically trained men (VO2max mean ± SD = 4,154 ± 629 ml·min-1) performed a maximal incremental test on a cycle ergometer to determine actual VO2max. An aerobically trained man was defined as someone who had participated in continuous aerobic exercise 3 or more sessions per week for a minimum of 1 hour per session for at least the past 18 months. Nine previously published VO2max equations were modified for use with aerobically trained men. The predicted VO2max values from the 9 modified equations were compared to actual VO2max by examining the CE, standard error of estimate (SEE), validity coefficient (r), and total error (TE). Cross-validation of the modified non–exercise-based equations on a random subsample of 50 subjects resulted in a %TE ≥ 13% of the mean of actual VO2max. Therefore, the following non-exercise-based VO2max equation was derived from a random subsample of 112 subjects: VO2max (ml·min-1) = 27.387(weight in kg) + 26.634(height in cm) - 27.572(age in years) + 26.161(h·wk-1 of training) + 114.904(intensity of training using the Borg 6-20 scale) + 506.752(natural log of years of training) - 4,609.791 (R = 0.82, R2 adjusted = 0.65, and SEE = 378 ml·min-1). Cross-validation of this equation on the remaining sample of 40 subjects resulted in a %TE of 10%. Therefore, the non-exercise-based equation derived in the present study is recommended for estimating VO2max in aerobically trained men.
The purposes of the present study were to (a) modify previously published VO2max equations using the constant error (CE = mean difference between actual and predicted VO2max) values from Malek et al. (28); (b) cross-validate the modified equations to determine their accuracy for estimating VO2max in aerobically trained men; (c) derive a new non–exercise-based equation for estimating VO2max in aerobically trained men if the modified equations are not found to be accurate; and (d) cross-validate the new VO2max equation using the predicted residual sum of squares (PRESS) statistic and an independent sample of aerobically trained men. One hundred and fifty-two aerobically trained men (VO2max mean ± SD = 4,154 ± 629 ml·min-1) performed a maximal incremental test on a cycle ergometer to determine actual VO2max. An aerobically trained man was defined as someone who had participated in continuous aerobic exercise 3 or more sessions per week for a minimum of 1 hour per session for at least the past 18 months. Nine previously published VO2max equations were modified for use with aerobically trained men. The predicted VO2max values from the 9 modified equations were compared to actual VO2max by examining the CE, standard error of estimate (SEE), validity coefficient (r), and total error (TE). Cross-validation of the modified non–exercise-based equations on a random subsample of 50 subjects resulted in a %TE ≥ 13% of the mean of actual VO2max. Therefore, the following non-exercise-based VO2max equation was derived from a random subsample of 112 subjects: VO2max (ml·min-1) = 27.387(weight in kg) + 26.634(height in cm) - 27.572(age in years) + 26.161(h·wk-1 of training) + 114.904(intensity of training using the Borg 6-20 scale) + 506.752(natural log of years of training) - 4,609.791 (R = 0.82, R2 adjusted = 0.65, and SEE = 378 ml·min-1). Cross-validation of this equation on the remaining sample of 40 subjects resulted in a %TE of 10%. Therefore, the non-exercise-based equation derived in the present study is recommended for estimating VO2max in aerobically trained men.
Address correspondence to Mr. Moh H. Malek, mmalek@unlserve.unl.edu.
© 2005 National Strength and Conditioning Association
