1983 Volume 27 Issue 4 Pages 287-299
The present study was designed to examine the sexual difference of the factorial structure of swimming ability in well-trained junior high school swimmers. Factor analytic technique was applied to each correlation matrix of boys and girls, which consisted of a total of 66 selected variables. The main results were as follows; 1) It was inferred that the factorial structures of both swimming abilities were composed of many common factors. The differentiation in the domain of physique and static strength for girls seemed to advance more rapidily as compared to that for boys, while the domain of flexibility for boys differentiated to a greater extent. 2) From the examination of communality, it was inferred that the domains of swimming skill, physique, and cardio-respiratory functions showed high relationships with other ability domains in both sexes. Relationships of elementary swimming skills with other domains were higher in girls, while in boys higher relationships were observed between static strength and other domains. 3) It was inferred that, in boys, six factors, i.e., swimming speed skill, body bulk and static strength, agility of total body, static balance, ankle flexibility, and linearity of physique, developed in accordance with the advance in age, but, in girls, only two factors of body bulk and static strength showed developmental trend with age. 4) For boys, the development of swimming speed skill seemed to be larger than that of body bulk and static strength in the 7th grade, while the former seemed to be inferior to the growth of linearity of physique in the 7 th and 8 th grades. Furthermore, it was suggested that swimming speed skill developed as accompanied by the growth of linearity of physique from the 7 th to 8 th grade, and then, the development of body bulk and static strength from the 8 th to 9 th grade.