Publication:

不同坡度對自由車的下肢運動學影響

本研究的主要目的旨在探討不同坡度情境下，自由車踩踏的運動學特徵差異。研究以3名優秀自由車運動員為自願的實驗參加者，其平均年齡19.6 □ 1.1歲、平均身高169.4 □ 2.6公分、平均體重69.2 □ 1.8公斤，並要求實驗參加者在無坡度、上坡7度、上坡15度、下坡7度、下坡15度等情境下以30公里/小時的速度踩踏，運動學參數的記錄與計算為VICON三度空間動作分析系統（500Hz）。研究結果顯示下肢關節角度最大值與最小值不會因為上坡或下坡斜度的實驗操弄而有統計的顯著差異（p > .05），從上死點（0度）到下死點（180度）的動作過程，上坡踩踏的時間高於無坡度情境，而無坡度情境踩踏的時間則高於下坡踩踏的情境。由於坐墊與踏板限制了下肢工作的範圍，致使下肢運動學參數特徵沒有差異存在，而騎乘坡度影響踩踏動作時間的內在機制，則需要未來動力學分析深入探討。

The purpose of this study was to compare the kinematical differences of lower extremity under various conditions of slop in cycling. There were three elite cycling athletes served as the voluntary participants for this study. Their age, body height, and body weight were 19.6 □ 1.1 years old, 169.4 □ 2.6 cm, and 69.2 □ 1.8 kg respectively. Participants were asked to ride on cycling under the conditions of slop of 0°, uphill 7°, uphill 15°, downhill 7°, and downhill 15° in the speed of 30 km/hr. The Vicon three-dimensional cinematography system (500Hz) was used to record and to analysis the kinematical parameters for this study. The results showed that there were no differences significantly among the conditions of uphill or downhill for the maximal and minimal joint angles of lower extremity (p > .05). During the movement process of top dead center (0°) to bottom dead center (180°), the durations of uphill were higher than flat road and the flat road was higher than the conditions of downhill. The range of motion of lower extremity was limited between sattel and pedal, and it led to there were no differences in the kinematical characteristics of lower extremity in this study. It is necessary to insight into the mechanism of pedal movement that effect on the slop of road by the kinetics analysis further.