The purpose of this study was to examine the effects of differences in the amount of activity between small-sided games of soccer played with and without walls. Twenty-four fifth graders at a public elementary school in Japan were asked to play a soccer game with a wall and one without a wall, respectively. The court size for both games was 20 x 10 m, the number of players was 3 vs. 3, and the game duration was 3 min. An accelerometer (OMRON, HJA-750C) was attached to the waist of each player to measure the duration of moderate to vigorous physical activity.
　The main findings were as follows.
　(1) The proportions of moderate to vigorous physical activity in the games with and without walls were 94.9% and 90.7%, respectively, both of which exceeded 90%.
　(2) Regardless of physical fitness level, games with walls led to longer periods of vigorous intensity activity and moderate intensity activity than games without walls.
　These results suggest that, regardless of children's physical fitness level, soccer games with walls encourage more vigorous intensity activity than games without walls.

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