Longitudinal Observation on the Limb Growth of Japanese-American Hybrids with Special Regard to Seasonal Variation

概要

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Somatometric analysis was done on longitudinal data of limb growth obtained from 60 male and 31 female Japanese-American hybrids. It revealed the hybrids had the longer upper limbs than the Japanese and the shorter lower limbs than the Americans. It was suggested that the growth of the upper limb might have been influenced rather strongly by the American characters and that of the lower limb by the Japanese characters. In the girth growth of the limb, however, no significant difference was found between the hybrids and either parental groups. Analysis of seasonal variation revealed that (1) the limb gained in length more markedly in spring and in girth in autumn than any other season, that (2) the upper limb reacted to the seasonal influence earlier than the lower, that (3) the proximal part of the limb reacted to such influence earlier than the distal, that (4) seasonal effect varied from one individual to another as well as from one year to another even in the same individual. The maximal velocity of limb growth occurred one or two months after the Equinox Day. Discussion was made on a relationship between seasonal cycle of growth velocity and the length of day and night.
日本人類学会の論文