ショウガッコウ コウガクネン ノ リツイ シセイ ト ソノ トクチョウ

The purpose of the present study was to classify standing posture of the upper grade elementary school children in the second sexual stage into five types according to Kendall's method, and to clarify factors affecting those postures by using seven muscle strength or flexibility tests. A total of 196 children (104 boys, 92 girls) were analyzed. Only 22% of children were a good posture even if the ideal and military postures were combined, whereas a bad posture, i.e., kyphosis-lordosis, flat-back and sway-back postures, accounted for 78%. The deviation of the body's center of gravity was significantly shorter in the good pasture than in the bad posture. When principal component analysis was applied to the data for seven muscular strength or flexibility tests, military posture had high overall evaluation of muscular strength and flexibility and kyphosis-lordosis posture was lower, whereas ideal posture was mainly held by muscular strength and flexibility of lower body and flat-back posture was mainly held by those of upper body. These findings suggest that it is necessary to improve muscle strength and flexibility in order to improve the bad standing posture of upper grade elementary school children

ショウガッコウ コウガクネン ノ ジュシン ドウヨウ ト ソノ エイキョウ インシ : Yシ Mショウガッコウ オ タイショウ ト シテ

The purpose of the present study was to measure the features of postural stability in children in the upper grades of elementary school and to elucidate the factors influencing postural stability. The subjects were 132 fifth-grade students and 72 sixth-grade students. Body sway was measured during upright posture with both legs or one leg, and then the total length of body sway was calculated. In addition, the subjects took some muscle strength and flexibility tests. The total lengths of body sway in girls were shorter than those in boys. In addition, the total lengths of body sway in the sixth-grade students were also shorter than those in the fifth-grade students. Furthermore, the subjects who were able to complete a muscle strength test of the body trunk demonstrated shorter body sway than did the subjects who could not complete the test. In contrast, muscle strength of the legs or flexibility of the whole body had no effect on body sway. These findings suggest that postural stability in individuals in the upper grades of elementary school depends on the muscle strength of the body trunk