兒童の體力の相關を中心とする考察

抄録

The same materials (boy of A and B schools : N 275), that the author reported in this Journal (1954) have been used again in this paper. Certain coefficients of correlation of physical strength with physical traits and of strength between groups have been calculated by the formula γ=∑Ni=1(xi-x)(yi-y)/√Sx×Sy(Table 1). Fig. 1 a*6a shows that γ/R=R±√F/(F+N-2) is the rejection limit with *=0 at a 5% level of significance. In these figures the point, |γ/R|>1, shows significant correlation at a 5% level of significance and * or ** has shown significant correlation differences between A and B school boys at a 5% or 1% level of significance. Fig. 1b*6b shows correlation curves formed by joining the means of physical strengths for the various classes.
The author has observed the following :
(1) Lung capacity is strongly correlated with stature, girth of chest, volume of chest (length×breadth×sagittal length) and weight. The coefficients of correlation are similar in both schools and according to age categories. But the mean of lung capacity for the same class of some traits (i. e., volume of chest) in the older year groups is greater than in the younger series and greater in A school than in B. (2) The correlation of back muscle rtrength with girths and weights is comparatively strong. The condition of the correlation curve is the reverse of that appearing in other articles. (3) The correlation of grip atrength with stature, girth of forearm and weights are a somewhat significant. (4) The correlations of running, jumping and throwing with each other are strong. The correlation of 50 m. running of stature and the length of the lower limbs are recognizable. (5) Jumping shows significant correlation with back muscle strength in every group showing that jumping is closely connected with muscle strength. Broad jumping is correlated strongly with stature, the lower limb and weight. But the mean of broad jumping for the same trait class (i. e, . length of upper thigh) in the older group categories is greater than in the younger age groups and in A school is greater than in B. The girths of the upper arm and the upper thigh show not only muscle growth but also fat deposition. The especially great girths, therefore, show not exceptionally large muscle strength or exercise capacity. (6) The correlation of ball throwing with back muscle strength is small and with girth of forearm is progressively greater with ascending age seniority.
Thus the author has considered the relation and the condition of the circumstances and the physical strength and traits in this report and their correlation in former reports with respect to their means.