在過去跑步機上與地面上跑的比較研究中發現，無論是運動學或動力學參數皆不盡相同。因此，以跑步機上測試結果推估地面上跑的結果是不適當的。跑步機上的運動應視為一種新的運動型態，其運動模式之建立顯然有其必要性。本研究的目的在探討使用跑步機跑步時，足部的運動狀態變化，以建立在不同速度及坡度情況下足部的運動模式，觀察著地期、擺盪期的各項參數是否隨速度及坡度產生趨勢變化，以及自己按鍵和別人按鍵對於各參數的影響。本研究招募15位有跑步機運動經驗的男性跑者，於跑步機上做改變速度及坡度兩種情況之跑步，第一天的測試由實驗人員按鍵，第二天的測試則是受試者自己按鍵，以動作捕捉系統擷取左右腳鞋面上足跟穩定架與前幫前端之光標位置，並分析各項足部參數。研究結果指出，自己按鍵在坡度轉換期間 (transition phase)，最大步長 (maximum stride length) 及足跟接觸跑帶瞬間鞋底角(sole angle) 的變異性顯著大於別人按鍵；自己按鍵在速度轉換期間，足跟接觸跑帶瞬間的前後方向速度、鞋底角，足跟足尖接觸跑帶距離差 (XTHS) 和步幅的變異性顯著大於別人按鍵。由此結果可知，在自己按鍵時這些步態參數產生較大的變異性，因此為了增加跑步狀態的穩定，建議可改變控制跑步機的方式，例如以特定動作或更簡便的調整方式取代按鍵控制跑步機，或改變按鍵的位置。在穩定期 (steady state) 中，擺盪期足尖最小高度 (Toe Clearance, TC) 隨坡度和速度增加而變大；XTHS隨坡度升高而增大，速度升高而減小；速度增加步頻變快，足跟足尖離開跑帶距離差 (XTHO) 減小，其他則無一致升高或降低之趨勢。另外，在本研究中發現，右腳的參數較易出現不穩定的現象，建議未來研究可在更深入探討實際原因是否因為按鍵位置影響或是其他因素造成左右腳在各個參數中的差異及其意義。

Previous studies found that there have many differences in kinetic and kinematic parameters between overground and treadmill running. Therefore, applying the results from treadmill running to overgound running is not appropriate. Treadmill movement should be regarded as a new motion mode. Establishing the treadmill motion mode is necessary now. The purpose of this study was to investigate the foot kinematics during treadmill running. Fifteen experienced treadmill runners were asked to run on a motor-driven treadmill under changing speed and incline. Two testing sessions were finished: the first session on one day, the speed or inclination keys were pressed by experimentor (EP); the second session on another day, the keys were pressed by the subject (SP). A motion capture system (visualeyes4000) was used to recognize the positions of the four markers on the bilateral heel counter and toe box at the same level. During inclination transition, maximal step length and sole angle had greater variability under SP than those under EP. During speed transition, SP had larger variability for sole angle, XTHS, XTHO and stride length than EP. The results implied that pressing keys by the subjects themselves during treadmill running will cause the unstable gaits in the transition phases. During steady state, toe clearance (TC) increased as the speed or incline increased; XTH increased as the incline increased, but decreased as the speed increased; Stride frequency increased and XTHO decreases as the increased speed.

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