Abstract
The purpose of this study is to investigate the relationship between the bat swing speed, trunk muscle thickness of dominant side and non-dominant side, and asymmetry. This study was conducted on 30 high school baseball hitters. B-mode ultrasound imaging was used to measure the thickness of the both side of rectus abdominis, external abdominal oblique, internal abdominal oblique, transverse abdominal, abdominal wall and lumbar multifidus. As a result, there was a significant correlation between internal abdominal oblique of dominant side, abdominal wall and bat swing speed. There was no statistical correlation between the bat swing speed and muscle asymmetry. In conclusion, the size of muscle is more important than the asymmetry of muscles in the dominant and non-dominant sides.
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