Abstract
The purpose of this study was to visually investigate changes in the physiological balance of the body accompanying development, determined through the annual relative growth coefficient of the legs, and the correlation between this coefficient and the annual number of injury sites. We used the school health statistical research conducted by the Ministry of Education, Culture, Sports, Science and Technology to obtain the data for height and leg length. In further, for the length of the legs, we subtracted the sitting height from the body height. For the injury location data, we used the key statistics organized by the National Agency for the Advancement of Sports and Health. We found that the period when leg development is quite marked is at 10 years of age for males and 9 years of age for females, and changes in the arm injury ratio show similar results. This indicates that the sitting height documented in developmental records can be utilized for school safety and physical education.
