Physical fitness differences between athletes and nonathletes: Do changes occur as a function of age and sex?

Abstract

The main objectives were to determine (a) if physical fitness superiority of athletes over nonathletes increases as a function of age, and (b) if the magnitude of athlete-nonathlete fitness differences are the same in males as in females, and if these differences are consistent across ages. Approximately 3,000 students in grades 3, 7, and 11 (ages 9, 13, and 17 years) were tested on measures of static and explosive muscular strength, static and dynamic muscular endurance, cardiovascular endurance, and flexibility. MANOVA and follow-up univariate ANOVAs indicated that the higher the grade, the better the performance; males outperformed females on all measures except flexibility; and athletes were superior to nonathletes on all six test items. Furthermore, (a) there was no difference between athletes and nonathletes at grade 3, athletes were considerably better than nonathletes by grade 7, and the magnitude of the difference was virtually the same at grade 11, (b) the fitness superiority of athletes over nonathletes was essentially of the same magnitude for males as for females at each grade level.