Abstract

A major problem in administering the Astrand-Ryhming Test to low-fit individuals is their inability to maintain a workload sufficient to produce valid exercise heart rates. Since differences in perceived exertion have been observedat different pedalling speeds, the use of a higher pedalling speed might be preferred. The purpose of this study was to determine the validity of the Astrand-Ryhming Test administered at 50 and 80 rpm. Thirty male volunteer subjects were randomly assigned to test order groups. The tests consisted of: (a)Astrand-Ryhming Test administered at 50 rpm; (b) Astrand-Ryhming Test administered at 80 rpm; and (c) maximum oxygen intake determined at the end of a graded exercise test. The results revealed relatively low validity coefficients of rxy = 0.64 and rxy = 0.63 for Astrand-Ryhming Tests administered at 50 and 80 rpm, respectively. The correlation between the 50 and 80 tests was r = 0.85. Oneway analysis of variance for repeated measures, and subsequent Duncans new Multiple Range Test, revealed that the criterion maximal oxygen intake values were significantly higher than those predicted by the AstrandRyhming Test. No differences were observed between the 50 and 80 rpm AstrandRyhming Test protocols. It was concluded that the administration of AstrandRyhming Tests at 80 rpm isacceptable, and the resultant predictions of maximal oxygen intake are clinically accurate. It was suggested that use of the Astrand-Ryhming Tests be limited to general fitness screening situations wheremore sophisticated techniques are unavailable. Verf.-Referat