出版社：Japan Society of Physical Education, Health and Sport Sciences
摘要：Longitudinal growth data of every month from birth to age 6 in 41 infants were examined. Weight (Y) corresponding to height (X) was plotted on logarithmic graph to obtain the allometric expression Y=bX^a, where a is a growth index and b is a constant. The plotting showed a straight line and the first break of line (critical point) appeared at 5.l±l.4 month. After the critical point, the growth index a was decreased from 3.17±0.80 to 1.57±0.25. In most cases the critical point corresponded with the development of motor ability such as twisting their upper parts of the body when rolling over and sitting held their hands by adult. At the time when the critical point appeared, the tooth did not erupt yet, but the weaning was beginning to practice. After the first critical point, two (12 cases) or three (9 cases) breaks of the line, in some, cases were observed and the growth line appeared to be like a stair-case. But in these cases, any particular factors such as environmental or developmental changes which were considered to be due to the critical points were not appeared. So it was simply considered as the growth rhythm which was caused by the acceleration of weight growth alternated with that of the height.
其他摘要：Longitudinal growth data of every month from birth to age 6 in 41 infants were examined. Weight (Y) corresponding to height (X) was plotted on logarithmic graph to obtain the allometric expression Y=bX^a, where a is a growth index and b is a constant. The plotting showed a straight line and the first break of line (critical point) appeared at 5.l±l.4 month. After the critical point, the growth index a was decreased from 3.17±0.80 to 1.57±0.25. In most cases the critical point corresponded with the development of motor ability such as twisting their upper parts of the body when rolling over and sitting held their hands by adult. At the time when the critical point appeared, the tooth did not erupt yet, but the weaning was beginning to practice. After the first critical point, two (12 cases) or three (9 cases) breaks of the line, in some, cases were observed and the growth line appeared to be like a stair-case. But in these cases, any particular factors such as environmental or developmental changes which were considered to be due to the critical points were not appeared. So it was simply considered as the growth rhythm which was caused by the acceleration of weight growth alternated with that of the height.
