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The purpose of this study was to evaluate the validity of the predicted V02 max from the Astrand-Ryhming nomogram, using the cycle ergometer as the sole exercise mode and following the recommended submaximal test protocol. In addition, two sets of age correction factors were compared for accuracy. Using the Astrand age correction factors, the SEE of the predicted V02 max for the 40 male subjects was .42 L.mini1 or 5.7 ml.kg 1.minf1, (r = .76 and .83, respectively); there was no significant difference between the measured and the predicted means. Although virtually identical SEE and r were found when applying the von Dobeln age correction factors, a significantly lower predicted mean was found (p < .05), which indicated a consistent tendency to underestimate the actual V02 max. These results suggest that the Astrand age correction factors should be used in conjunction with the Astrand-Ryhming nomogram, especially when classifying subjects into various fitness classifications.The original Astrand-Ryhming nomogram was computed from the data for 58 subjects who performed submaximal tests on a cycle ergometer and maximal tests on either a cycle ergometer or a treadmill (P.-O. Astrand and Ryhming, 1954). However, the 144 subjects tested for the modification of the nomogram used only the cycle ergometer for their submaximal and maximal tests. The data from both sets of subjects were combined to form the modified nomogram (I. Astrand, 1960

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