“…Because of the exceptionally high maximum oxygen intakes reqorded in distance runners (Astrand, 1956;Saltin and Astrand, 1967; Costill and Fox, 1969; Fox and Costill, 1972) and owing to the lack of relationship between specific respiratory parameters (Gordon, Levine, and Wilmaers, 1924;Costill, 1967; McKethan and Mayhew, 1972), cardiovascular variables (Montoye, Mack and Cook, 1960;Slusarek, 1958; Massey, Husman and Kahoe, 1953) and endurance performance, maximal oxygen intake has been labelled the best predictor of distance-running ability (Saltin and Astrand, 1967;Costill, 1967Costill, , 1968). However, recent research has shown significant but relatively low correlations (r = .43 -.47) between 162max (ml/min/kg) and two-to three-mile run times (Wiley and Shaver, 1972), while other studies (Costill, 1967;Cooper, 1968;Ribisl and Kachidorian, 1969) have reported much higher relationships (r = .79* -.85).…”