To compare physiological characteristics of rugby union, HR and RPE were measured for 10 high school students in sevens rugby games.
    Each subject's HR in a sevens rugby game fluctuated up and down periodically between 120-190bpm, and it was higher than 80-200bpm in rugby union games. The average HR per minute during games also fluctuated between 150- 180bpm. The fluctuation of HR in sevens rugby games was smaller than that in rugby union games.
    BK had spent more time in “Maximal” and “High” area than FW from the view of the distribution of HR in sevens rugby games. But, FW had spent more time in “Moderate” and “Low” area than BK. This result was different from that of rugby union.
    There were no difference between the RPE of FW (15.8±1.9) and BK (15.9±2.1).
    These results indicate that training effect of rugby sevens will be expected by increasing the exercise intensity and reducing the rest time of rugby union games trainings.