探討不同性別之國小高年級學童於高台落下時，其著地動作與負荷上的差異及其下肢勁度調節之特性。方法：以國小高年級11 名男學童與10 名女學童為研究對象，利用一部MegaSpeed 高速攝影機 (120 Hz) 與一塊AMTI 測力板 (1200 Hz) 同步擷取學童從40 公分高台落下的著地資料，透過Kwon3D 與KwonGRF 軟體進行資料處理，並以彈簧質量模型計算腿部垂直勁度。利用SPSS 統計軟體進行獨立樣本t 檢定，顯著水準訂為α= .05。結果：男學童在著地瞬間膝關節角度與緩衝期間膝關節最小角度皆顯著大於女學童。男學童著地期間最大垂直地面反作用力、50 毫秒被動衝量、第一、第二峰值負荷率與緩衝期垂直勁度皆明顯高於女學童，且地面反作用力峰值出現時間較女學童提早。結論：國小高年級男學童高台著地動作膝關節採較僵直的著地模式與較大的垂直勁度，使其有較高的下肢傷害風險。

The purpose of this study was to examine whether gender differencesexist in lower extremity landing movement and vertical stiffness during the droplanding task. Methods: Eleven male and ten female elementary school students withno history of lower extremity injury performed a 40-cm drop landing. One MegaSpeedcamera (120 Hz) synchronized with an AMTI force plate (1200 Hz) were used tocollect the kinematics and kinetics data. Leg vertical stiffness was calculated by usinga spring-mass model. An independent t-test was used for statistical analyses (p < .05).Results: Male students landed with greater knee angle at initial foot contact thanfemale students. In addition, male students exhibited greater maximum ground reactionforce, passive impulse, loading rates and vertical stiffness, and time to peak force wasearlier than female students. Conclusion: Male elementary school students may have ahigher risk of injury in lower extremity during drop landing due to their straight kneeposition and higher leg vertical stiffness.