This study was designed to clarify the effects of anaerobic and aerobic trainings for on the physical fitness, and blood lactic acid (La) and the form of locomotion activity during a game in soccer players. The subjects were twelve soccer players of amateur top-level in Japan. Measurements of the physical fitness were done for body composition, leg extension power (LegP), maximum anaerobic power (AnPmax), 40-second power (40 secP), maximum blood lactic acid (Lamax) as well as running speed at OBLA (OBLA-V). These measurements were carried out five times during a training period: August and December in 1993, and March, May and August in 1994. Measurements during the game were conducted in August, 1993 and in May, 1994 for the exercise intensity using La and the from of locomotion activity using a video camera. As a result, relative and absolute fatness, and lean body weight improved significantly between August and December in 1993, and between December in 1993 and March in 1994. LegP increased significantly between December in 1993 and March in 1994. AnPmax, 40 secP, Lamax and OBLA-V increased significantly between December in 1993 and March in 1994, and between March and May in 1994. La, dash time and jogging time of the players during the game increased significantly between August in 1993 and May in 1994. But, there weren't significant differences in %Lamax of the players during the game. These results indicates that the improvement of anaerobic and aerobic capacities in soccer players led to positive effects on activity levels of the high intensity during the game.
