西式划船腳蹬板角度對拉槳階段之影響

The effects of foot-stretcher angle on the drive phase in rowing

目的：探討西式划船選手在划船測功儀上進行一分鐘划船測驗時，使用不同腳蹬板角度（39°、42°、45°與48°）對各項力學參數表現特徵之影響。方法：以十二名大專女子划船選手為受試對象，各受試者須在ConceptII划船測功儀上完成四種不同腳蹬板角度之一分鐘划船測驗。利用JVC數位攝影機（60Hz）與Biovision拉力計（600Hz）同步擷取划船者的矢狀面划船動作與拉槳階段之拉力值，並以單因子重覆量數變異數分析檢定各力學參數之差異。結果：隨腳蹬板角度的增加，踝關節不論在最大背屈與最大蹠屈角度上皆有明顯減小的現象，且不同腳蹬板角度間皆達顯著的差異（p<.05）。其次，在39°腳蹬板角度下，每槳平均功率與拉槳階段平均功率皆明顯較45°與48°腳蹬板角度為高（p<.05）。結論：就腳蹬板角度的評估指標而言，以39°腳蹬板角度整體划船效率與拉槳階段效率為最高。其次，在自覺推蹬舒適度及施力難易度量表上，半數以上的受試者亦較偏好39°的角度；因此在腳蹬板角度的選擇上，建議划船教練與選手應以39°腳蹬板角度為優先考量。

Purpose: The purpose of this study was to investigate the effect of foot-stretcher angles (39°, 42°, 45° and 48°) on the drive phase in rowing. Method: Twelve college female rowers participated in this study, and each subject was asked to perform 1-min test under four foot-stretcher angles on Concept II rowing ergometer. One JVC digital camera (60 Hz) and Biovision load cell (600 Hz) were synchronized to collect the kinematics and pulling force. An ANOVA for repeated measures was used to identify the differences for each dependent variable. Results: The result indicated that when increase the foot-stretcher angle, the maximum dorsiflexion and plantar flexion angles of the ankle were decrease. Besides, the rower could produce a higher mean power per stroke and mean power per drive phase in 39° foot-stretcher than that in 45° and 48° (p< .05). Conclusion: For the results of this study, 39° foot-stretcher is optimum in rowing efficiency. In addition, more than half of the subjects prefer 39° foot-stretcher for perceived comfort. It was suggested that the rower could choose 39° foot-stretcher in training and competition.