In order to determine optimum time of muscle training for individual rugby players, the authors studied relationship between maturity and specific body surface area (
s: body surface area/weight) of rugby players that had played rugby in middle and high school based on longitudinal data for stature growth and body surface area.
The subjects of the study were 74 students of T High School, which won the national championship in 2000 and K High School that won the national championship for three years consecutively in 2002, 2003 and 2004 that were born between the years 1984 and 1986.
Data used for the study consisted of longitudinal stature and weight measured in April each for a period of 12 years from elementary school through high school.
The similar growth curve was observed for growth velocity for longitudinal stature from the standpoint of physiological age based on age at peak height velocity for both average type and early maturity type.
On the other hand, the similar growth curve was observed for specific surface area (1/
s) up to age at peak height velocity manifestation for both average type and early maturity type, but subsequent to age at peak height velocity manifestation, the average type exhibited an increase in body surface area (1/
s) than the early maturity type. Full-scale muscle training beginning in high school was more suitable for the average type than the early maturity type both qualitatively and quantitatively.
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