• 作者： 李永輝; 鄭誠功; 曾永輝
• 作者服務機構： 國立台灣工業技術學院工業管理技術系; 國立台灣大學醫學院醫學工程研究中心; 國立台灣大學醫學院骨科部
• 中文摘要： 本研究探討在爬梯時，於人體關節及梯腳產生之反作用力。描述爬梯動作之運動學資料是由動作分析系統獲得；反作用力是根據運動學資料及本研究所發展之力學模式計算而得。實驗之變項包括(1)70及75度之水平傾角；(2)-決速（106步／分鐘）及慢速（86步／分鐘）之爬梯速度。 力學模式經實測之足底反作用力驗證其實用性。研究結果發現，隨著足底與梯桿之接觸時機之不同，足底之最大摩擦力發生在7％及38％的接觸期，然其方向相反。不同傾角造成受試者在75度時其身體重心有後仰之現象，且其重心水平分力較小。受試者在快速爬梯時，身體亦出現後仰之現象，且身體受力亦大。此外，手部肌力在保持身體平衡上，扮演重要之角色。
• 英文摘要： This paper presents the findings of a study conducted to determine the peak forces generated inthe articulated joints and the foot/floor contact point of a ladder while an individual was engaged in ladderclimbing. A kinematic description of joint movements and the calculation of forces acting on each bodysegment as well as the foot of the ladder were obtained on the basis of videographic data. Task variationswere (1) slant angle (70 degrees and 75 degrees with the horizontal) and (2) climbing speed (86 steps/minand 106 steps/min). It was identified in this study that the ladder's friction forces had a time variant nature as a resultof biodynamic movements. There were two peak friction coefficients, in opposite directions, occurring at7% and 38% of each half of the strike time. The primary differences between climbing the ladders at 70and 75 degrees were a greater posterior displacement of the body's center gravity and smaller peak centergravity shearing forces in climbing the 75 degree ladder. There were greater posterior displacement of thecenter gravity of body and a larger biomechanical load while climbing at 106 steps/min than at 86 steps/min.
• 中文關鍵字： biomechanics; ladder safety; climbing strike.
• 英文關鍵字： --