投球動作における多点筋電位測定

摘要

The purpose of this study was find out a throwing motion which actualize effective pitching. In this study, the multi-channel electromyography(EMG) measurement system using conductive fabric was designed. As a result, we found differences of EMG between beginner and expert. 1) Experts bent their wrist toward the palm. 2) Experts inflected elbow and lifted elbow to their shoulder height. 3) Experts relaxed their muscles between taking back and release. In particular, storing of energy in tendon at taking back and using the energy between taking back and release are important for throwing motion which actualize effective pitching.%本稿では野球経験者と未経験者の投球動作時の筋電位を測定，比較した.その結果，野球経験者の投球動作には，テイクバック時の肘の屈曲と肩上への引き上げ，テイクバック時の手首の掌届，テイクバックからリリースに移るまでの間計測した全筋肉の弛緩が観察された.特にテイクバック時の手首の掌屈により腱にエネルギーを蓄え，リリースに移る間に脱力してそのエネルギーを利用することが効果的な投球動作には重要であり，野球経験者はそのような身体の使い方をしていることが明らかとなった.