The limb composition in the growing generation.
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概要
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The purpose of this study was to investigate the limb composition in the growing generation. The cross-sectional areas of fat and muscle at the right side of forearm, upper arm, leg, and thigh were measured by using ultrasonic apparatus for 127 boys and 124 girls aged from 7 to 18 years. The fat areas in boys increased from 7 to 12 years, decreased between 12 and 14 years, and increased again after 14 years. The fat areas of girls unchanged between 7 and 11 years, increased largely from 11 to 14 years with age, and remained almost constant after 15 years. The muscle areas in boys increased with age from 7 to 18 years. On the other hand, the muscle areas of girls increased under 14 years at upper arm, under arm, under 16-17 years at other measurement sites. The sex differences in fat and muscle areas became prominent after 13 years. The ratio of fat to muscle area (fat/muscle area ratio) decreased in boys from 12 to 14 years, but showed almost constant in other age. The fat/muscle area ratio in girls decreased from 7 to 12 years, but increased from 12 to 14 years. These results suggest that the relative increase of both fat and muscle areas in boys are almost the same from 7 to 12 years and from 14 to 18 years. And in girls, the relative increase in muscle area is superior to that of the fat area between 7 and 12 years, but conversely fat area increase predominately over that of the muscle area from 12 to 14 years. The ratio in fat area of forearm to upper arm as well as leg to thigh decreased at the age when fat areas were increasing. The ratio in muscle area of forearm to upper arm decreased with age from 7 to 18 years in boys and from 7 to 14 years in girls. On the other hand, the ratio in muscle area of leg to thigh were kept almost constant both in boys and girls during the whole age. Therefore, it will be assumed that the increase of fat areas at upper arm as well as thigh are relatively larger than that of forearm and leg. And the growth of the muscle area at upper arm is relatively larger than that of forearm during developmental age.
- 日本人類学会の論文
日本人類学会 | 論文
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