Purpose: The purpose of this investigation was to cross-validate existing V O 2max prediction equations on samples of aerobically trained males and females. Methods: A total of 142 aerobically trained males (mean Ϯ SD; 39.0 Ϯ 11.1 yr, N ϭ 93) and females (39.7 Ϯ 10.1 yr, N ϭ 49) performed a maximal incremental test to determine actual V O 2max on a cycle ergometer. The predicted V O 2max values from 18 equations (nine for each gender) were compared with actual V O 2max by examining the constant

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... error (CE), standard error of estimate (SEE), correlation coefficient (r), and total error (TE). Results: The results of this investigation indicated that all of the equations resulted in significant (P Ͻ 0.006) CE values ranging from Ϫ216 to 1415 mL·min Ϫ1 for the males and 132 to 1037 mL·min Ϫ1 for the females. In addition the SEE, r, and TE values ranged from 266 to 609 mL·min Ϫ1 , 0.36 to 0.88, and 317 to 1535 mL·min Ϫ1 , respectively. Furthermore, the lowest TE values for the males and females represented 10% and 12% of the mean actual V O 2max values, respectively. Conclusions: The results of the analysis indicated that the two equations using age, body weight, and the power output achieved at V O 2 as predictor variables had the lowest SEE (7.7-9.8% of actual V O 2max ) and TE (10 -12% of actual V O 2max ) values and are recommended for estimating V O 2max in aerobically trained males and females. The magnitude of the TE values (Ն20% of actual V O 2max ) associated with the remaining 16 equations, however, were too large to be of practical value for estimating V O 2max .