前言：幼兒的動作協調發展評估是非常重要且關鍵的時期，其中跳躍動為動作協調發展中的重要動作技巧之一，然而目前少有研究運用客觀且精確的影像動作分析系統作為研究工具，探討幼兒之跳躍動作品質。
目的：本研究目的是以二維（2D）影像動作分析系統，量測幼兒於執行左右橫跳動作之人體運動學特徵參數，探討影響跳躍動作協調之關鍵人體運動學因子，以作為未來動作協調發展之參考。
方法：研究對象以68位年齡 6 至 7 歲（平均75.71 ± 4.98月）幼兒，男女童各 34 位，進行兩次十秒內最大努力之左右橫跳測試，並以二維（2D）影像動作系統擷取左右橫跳兩垂直方向包含：髖及膝關節屈曲角度改變量 (°)、垂直跳躍高度 (公分)、水平速度 (公尺/秒) 以及反應時間 (秒) 共五項人體運動學參數。 以皮爾森積差相關性分析 (Pearson Correlation) 探討各人體運動學參數與動作表現之相關性，單因子共變數分析 (One-way ANCOVA) 比較執行左右橫跳「正確」與「錯誤」動作於各參數之差異，最終以逐步迴歸分析 (Multiple Regression analysis) ，討影響幼兒跳躍動作品質之關鍵因素，並找出決定性之人體運動學參數。
結果：經皮爾森積差相關性分析顯示，年齡 (r =.351, p =.003 < .01) 、水平速度 (r =.573, p < .001)、髖關節屈曲角度改變量 (r =.596, p < .001)、膝關節屈曲角度改變量 (r =.589, p < .001)、反應時間 ( r=.629, p < .001) 及垂直跳躍高度 (r =.513, p < .001) 皆與左右橫跳成績呈顯著相關。逐步迴歸分析結果顯示：年齡、水平速度、垂直跳躍高度及反應時間對於左右橫跳之動作表現具有顯著相關 (R = .774, p = .006 < .01)，解釋力達60.0% ( R² = .600)，是影響動作表現的60% 關鍵運動學參數。最終將年齡作為共變量進行單因子共變數分析，發現「錯誤」動作之髖關節屈曲角度改變量 (F = 4.057, p =.044 < .05) 顯著大於與「正確」動作，以及水平速度上 (F = 33.487, p < .001) 亦顯著小於「正確」之動作，於單因子共變數分析結果中顯示，「錯誤」動作相較於「正確」動作執行時，於髖關節角度改變量 (°) 上增加了 15.00 %，於水平速度 (公尺/秒) 上則減少了13.85 %，兩項運動學參數均為顯著影響執行左右橫跳動作品質上之關鍵因素。
結論：本研究結果顯示五項人體運動學參數皆為影響左右橫跳成績的因素，並且與動作表現間，具有中度至高度顯著相關性。證明影響左右橫跳動作表現的運動能力不僅僅只有敏捷能力，更同時包含平衡能力、協調能力、速度以及爆發力的均衡發展。此外，髖關節角度改變量與水平速度亦是執行左右橫跳動作品質上之關鍵因素。其中提升速度、減少垂直跳躍高度及縮短反應時間，為提升左右橫跳動作表現之決定性因子。進一部綜合比較後發現水平速度 (公尺/秒) 為同時影響動作表現及動作品質之決定性因子，提升該速度能力可作為改善左右跳躍動作協調之參考。。
建議：建議未來可以透過遊戲活動的方式，使幼兒執行有目標性之動作，透過指定空間範圍內及規則上之限制，控制身體執行相對應之反應動作，鼓勵兒童多嘗試側併步及橫向跳躍障礙物的訓練，包含如跳格子、繩梯、跳繩等等，訓練協調能力的發展，同時提升其動作表現。

SUMMARY
Purpose: To evaluate the motion quality of lateral jump movements performed by preschool children through a two-dimensional video analysis system to assess factors affecting the development of motor coordination in childhood.
Method: A total of 68 children aged 6 to 7 (average 75.71 ± 4.98 months) were chosen to perform a side-to-side lateral jump test with a maximum of effort within 10 seconds. The kinematic parameters of the movements were captured by a 2D video analysis system, including variance of hip and knee joints flexion angle (°), vertical jump height (cm), horizontal velocity (m/s), and take-off action time (sec). Based on the collected data, Pearson correlation analysis was performed to assess the correlation between each parameter and lateral jump performance. Meanwhile, the stepwise regression analysis was conducted to explore the key parameters affecting children's lateral jump performance, and One-Way Analysis of Covariance (ANCOVA) was performed to analyze the motion quality of lateral jumps and make comparisons between correct and incorrect jump movements.
Results: As a result of the Pearson correlation analysis, the five kinematic parameters of age, horizontal velocity, hip flexion angle change, change in knee flexion angle, reaction time, and vertical jump height were moderately to highly correlated (p < .001) with the performance of lateral jumps. According to the stepwise regression analysis, age, horizontal velocity, vertical jump height, and take-off action time were the decisive kinematic parameters affecting the performance of lateral jump (R² = .600, p < .01). Meanwhile, the differences between variance of hip flexion angle and horizontal velocity were identified as the key factors affecting the performance of lateral jump (p =.044 < .05/ p < .001).
Conclusion: The horizontal speed (m/s) is a decisive factor affecting both the performance and the quality of the movement. Therefore, it is recommended to improve the speed ability as a key factor to promote the coordination of jumping movements
Suggestion: It is recommended that children can learn actions that are specific to jumping and reaction time through physical activities within designated space and rules, such as jumping rope, jumping over obstacles, shuttlecock kicking, hopscotch, or rope ladder to develop their motor coordination skills and enhance their movement performance.

Keywords: 2D video analysis, lateral jump, kinematic parameters, horizontal speed.

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