A New Nonexercise-Based V̇O2max Equation for Aerobically Trained Females

study were to (a) modify previously published V ˙ O2max equations using the constant error (CE) values for aerobically trained females, (b) cross-validate the modified equations to determine their accuracy for estimating V ˙ O2max in aerobically trained females, (c) derive a new nonexercise-based equation for estimating V ˙ O2max in aerobically trained females if the modified equations are found to be inaccurate, and (d) cross-validate the new V ˙ O2max equation using the PRESS statistic and an independent sample of aerobically trained females. Methods: A total of 115 aerobically trained females (mean SD: age 38.5 9.4 yr) performed a maximal incremental test on a cycle ergometer to determine actual V ˙ O2max. The predicted V ˙ O2max values from nine published equations were compared with actual V ˙ O2max by examining the CE, standard error of estimate (SEE), validity coefficient (r), and total error (TE). Results: Cross-validation of the modified nonexercise-based equations on a random subsample of 50 subjects resulted in a %TE 13 % of the mean of actual V ˙ O2max. Therefore, the following nonexercise-based V ˙ O2max equation was derived on a random subsample of 80 subjects: V ˙ O2max (mL·min1) 18.528 (weight in kg) 11.993 (height in cm) 17.197(age in yr) 23.522 (h·wk1 of training) 62.118 (intensity of training using the Borg 6–20) 278.262 (natural log of years of training) 1375.878 (R 0.83, R2 adjusted 0.67, and SEE 259 mL·min1). Cross-validation of this equation on the remaining sample of 35 subjects resulted in a %TE o