Takayuki Seto

The purpose of this study is to examine how to increase power (body weight × sprinting speed, kgm/sec.) and sprinting speed through testing and evaluation of a rugby player's power, taking into account sprinting speed. Stature (cm), weight (kg), and 50m sprint time (sec.) were collected upon enrollment of 1,206 rugby players born between 1981 and 1984 in a high school which participated in the nationwide competition. Power was calculated as the product of 50m sprinting speed (m/sec.) and weight (kg). As a result, the following was clarified: 1. A negative straight line relation was obtained between the logarithm of power to the specific body surface area (: s = body surface area (cm^2) / weight (g)) and the logarithm of the specific body surface area, and the following formula was derived. Power/s = 53.7s^<-2.66> 2. The following formula was obtained for power as a difference of body surface area and weight: log (Power) = -0.6859・logS + 1.163・logW ・・・・・(1) (ks, kw : const., S : Body surface area (cm^2), W : Weight (g)) 3. Physical power was predicted from Rugby players' weight and the surface area of a body. And from formula (1), the chart was produced which predicted power from stature and weight. Furthermore, the chart was created which can determine 50m sprint time from power and weight. 4. These charts achieved on testing and evaluation of power which took into account sprinting speed of rugby players.

This study evaluates the scoring performance of JBL basketball players though morphological examination, using data from 51 JBL basketball players in center and forward position, such as body surface area, body weight, and game scored. As a result, the following formula was obtained. log (RTP) = -2.345・logS +2.360・logW (RTP: rate of total points per min., S: surface area (cm^2), W: body weight (g)) There was no significant difference between the theoretical value for RTP obtained using this formula and the actual RTP as measured. Regarding the score obtained during the game, it was discovered that a basketball player's ability to score can be estimated from a theoretical value and an actual measurement.