The development of cardiorespiratory (VO₂max), muscular (muscle strength of knee extension (TMS)) and muscle oxidative function (Lactate threshold, LT) for 9 boys were longitudinally studied from 9 to 17 years of age, on the basis of skeletal growth, related to their corresponding structure (left ventricular diastolic diameter (LVDD), cross-sectional area of thigh muscle (TCSA), and relative gastrocnemius area to plantar flexor (G/PF respectively). When each para-meter was compared on the basis of chronological age, the age of spurt relatively varied from child to child and from parameter to parametey. However, the age of spurt for each parameter on the basis of skeletal age was 13 16 years for body height, 12~15 years for LVDD, 13~15 years for VO₂max, and 12~16 years for TMS and 13~16 years for LT-VO₂. In the development of cardiorespiratory system the tendency which the stracture increases faster than function was observed, while there was no a given relation between TCSA and TMS. The intraindiviudual agreement of the age of spurt among various parameters was observed in the boys who showed the spurt in the body height on the basis of the skeletal age. Such agreement was not always observed in the boys who did not show the spurt in body height to skeletal age. LT-VO₂ tended to increase with age without last maturity and VO₂max increased more than LT. Therefore %LT didn't show a constant relation to age. As a result, large inter-individual differences were observed. This interindividual difference was dependent on G/PF. The correlation between %LT and G/PF was maintained through the development. From these results, the longitudinal study on the basis of skeletal growth and body height was available to describe the physiological maturation and relating function through the development including puberty.

DESCENTE SPORTS SCIENCE Vol.11/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE