本研究的目的是在比較國小學童不同高度（20、40、60公分）赤腳著地時的運動學和動力學特徵。實驗以台北市社子國小五名六年級男性學童為受試者，平均身高為149.9 ± 5.6公分，平均體重為40.8 ± 4.5公斤，平均年齡為12.1 ± 0.3歲。運動學和動力學的資料是使用Peak Performance高速攝影機（120Hz）和KISTLER測力板9287型（1200Hz）同步收集資料並以自行撰寫的C 程式語言解動力學逆過程，進一步獲得下肢各關節之軸向力、剪力、肌肉力矩、肌肉功率和肌肉所作的功。並以重覆量數單因子變異數分析（a =.05）處理著地時各階段的生物力學變數，達顯著差異後再以薛費法進行事後比較。
結果發現：髖、膝關節角位移和最大角速度，緩衝的時間，地面垂直反作用力的第一峰值和衝量，第二峰值，50毫秒內的被動衝量，緩衝期內的全部衝量，髖關節、膝關節和踝關節的最大軸向力（壓力）和剪力都隨著地高度的增加而顯著增加；而著地瞬間髖、膝關節角度，重心最低時髖、膝關節角度，踝關節最大角速度產生時間，第一峰值到第二峰值的時間都隨著地高度增加而減少。
在赤腳著地時，因為動作不正確可能使得骨骼肌肉系統因承受不了過大的力量和衝量而發生潛在性的傷害。所以在赤腳著地瞬時，建議國小學童要先主動屈曲髖關節同時伸展膝關節和踝關節，繼而伸展髖關節並增加髖、膝關節的角位移，延長緩衝的時間，以減低因著地所產生的巨大撞擊力量，避免可能造成的傷害。

The purpose of this study is to analyze the kinematic and kinetic differences of children drop landing with barefoot from three different heights(20,40,60cm). Five male six-grade children served as the subjects for this study. The mean height, mass and age were 149.9±5.6cm,40.8±4.5kg and 12.1±0.3 years, respectively. Kinematic and kinetic data were acquired simultaneously by using a Peak Performance high speed camera(120Hz) and a Kistler (model 9287) force platform (1200Hz), and then data processed by a computer program written in C language in order to acquire the normal forces, shear forces, net muscle joint moments, muscle joint powers and work done on the extensor muscles of the ankle, knee, and hip. The selected variables were tested by one-way repeated ANOVA (a = .05) and Scheffe method posterior comparisons.
The results indicated that there were significant increases in lower extremity joints displacement and the greatest angular velocities (hip and knee joints), total landing time, first peak vertical reaction force, impulse from contacting the force platform to the first peak vertical reaction force , second peak vertical reaction force, 50ms impulse, total landing impulse, peak normal force (compress), and shear force in the three lower extremity joints as the landing height increases. Also, there were significant decreases in hip and knee angles at landing, hip and knee angles when body CG (center of gravity) at the lowest point, the time to the maximum ankle angular velocity and the time between first peak vertical reaction force and second peak vertical reaction force as the landing height increases. During the barefoot landing, the improperly landing skill may increase the possibility of injury. It is suggested that when teaching children landing from a greater height, the children should actively flex hip and extend ankle joint first, and then extend hip joint to increase lower extremity joints displacement and landing time, which will reduce the impact force, in order to avoid the potential of injury.

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