目的：本研究主要探討助跑與重心縱移幅度對成績表現之影響。方法：以五部每秒60張畫面的攝影機，拍攝九十二年全國運動會男女三級跳遠決賽各八位選手為受試者，以14個肢段、21個關節點的人體模型，實施二度空間的影片分析。結果與結論：一、男女選手為了能夠精確踩板，造成最後一步步幅最小，與成績相關性上，僅女子在最後第三步及最後第一步達顯著相關意義（r=0.711, r=0.765, p＜.05）。二、助跑最後十公尺平均速度男子9.91±0.28公尺／秒，女子7.83±0.16公尺／秒，與成績相關僅男子在6-10公尺達顯著相關意義（r=0.915, p＜.05）。三、男女助跑利用係數分別為1.61、1.57其中女子雖然有較高的利用係數，但由於助跑速度較慢情形下，無法創造較佳成績。四、男女重心縱移幅度均以跨跳階段重心下降幅度最大，與速度及成績相關性上，均未達到顯著相關意義。建議：加強選手助跑絕對速度，降低水平速度損失提昇成績表現。

Purpose: The purpose of the study is to analyze the influence of approach speed and forwarded gravity of the body to the performance of Triple Jumpers. Method: In the study, five video cameras with speed of 60 frames per second were used to film the 2003 National Athletic Meet for male and female Triple Jump final competitions. Eight jumpers of each sex were tested on 14 segments and 21 joints. After analyzing the 2D film result and conclusion: 1. Both male and female jumpers tend to make the shortest last step in order to step on the board accurately. For female jumpers, the last step and the last third step are related to the performance. 2. The average approach speed for male jumpers in the last 10 meters is 3.91 ± 0.28 meter/second. For female jumpers, it is 7.83 ± 0.16 meters/second. Only the speed between 6 and 10 meters is related to the score. 3. The approach coefficient for male and female jumpers is 1.61 and 1.57. Female jumpers have higher coefficient, but their approach speed is slower. So, they can not create better achievement. 4. For both male and female jumpers, the movement of forwarded gravity is the largest at the last jump. It is not related to the speed and score. Suggested: In order to reach the better performance, they are suggested that to reinforce approach speed of jumpers and to reduce the horizontal speed loss.