固定與動態划船測功儀的下肢運動學與肌肉活動之比較

COMPARISON OF FIXED AND DYNAMIC ROWING ERGOMETER ON LOWER LIMB KINEMATIC AND MUSCLE ACTIVITY

本研究目的在探討在相同槳頻與平均負荷下，固定與動態測功儀下肢運動學及肌肉活動。研究方法：招募100年全國運動會划船選手5名，兩種測功儀均以個人最佳成績的之平均瓦特數的120%與風阻4情況下，隨機進行一分鐘測驗。使用動作分析系統擷取拉槳的運動學，計算拉槳與回槳階段的下肢髖、膝、踝關節角度、活動度及角速度；並使用表面肌電儀蒐集拉槳過程腹直肌、豎脊肌、股外側肌、股二頭肌、脛前肌及腓腸肌等六條肌肉活化情形，以均方根肌電值表示肌肉各階段肌肉活化程度，並以最大風阻情況下拉槳表現為標準化基準。研究結果：拉槳階段髖、膝關節角速度與髖關節活動度動態測功儀顯著高於固定測功儀，而執行動態測功儀時，腹直肌在拉槳階段跟股外側肌在回槳階段都顯著大於固定測功儀。研究結論：動態測功儀有較快的推蹬速度，推蹬阻力接近於單人雙槳，故動態測功儀在長期的陸上訓練可以幫助選手維持實際划船推蹬的感覺。

The purpose of this study was to investigate the difference of lower- extremity kinematics and muscle activities between concept2 stationary ergometer with or without slides by same stroking rate and average power. Five rowers of the 2011 national games were recruited. They were asked to do 1-min rowing performance with 120% average power of personal best recorder and drag resistance of 4. Angles， range of motion and angle velocities of hip， knee and ankle joints during drive and recovery phase were recorded by motion analysis. Six-muscle activities including rectus abdominis， erector spinae， vastuslateralis， biceps femoris， tibialisanterior and gastrocnemius muscles during drive phase were recorded through surface EMG. Muscle activities were presented as root mean square and normalized by max drag resistance condition.