スキージャンプ・テイクオフ時のEMG周波数解析

摘要

スキージャンプ・テイクオフにおける筋活動の評価にwavelet変換を用いたEMG周波数解析を応用し，テイクオフの客観的な分析を試みた．先ず，陸上競技の短，中，長距離選手にテイクオフ動作を課した.その結果，それぞれの種目特性を反映した解析結果が得られ，本手法の妥当性を確認した.次に，純ジャンプ選手と複合ジャンプ選手の比較を行った．その結果，純ジャンプ選手では，比較的速筋線経を多く活用している結果が得られ，これにより俊敏な動作を果たしていると考えられた．本研究を通し，提案手法によるテイクオフの客観的評価の可能性を得た．%To evaluate the muscular activity in the ski jumping take-off motion of ski-jumping, the frewuency analysis of EMG with the wavelet transform has been applied to different athletes. The effectiveness of the proposed technique was confirmed in the measurement of EMG's of a sprinter, a middle and a long distance runners. The analyzed results agreed well with their specialties. The frequency spectra of EMG's were analyzed and compared between the athletes of special jumping and Nordic combined jumping. The results indicated that the athletes of special jumping used the fast twitch fibers effectively leading to the quick movement. Through this study, the applicability of the proposed technique to the objective evaluation of the take-off has been verified.