目的：本研究藉由三維動作分析系統瞭解足部動作形態，探討赤足與穿著羽球鞋時，不同方向網前跨步動作的運動學與動力學分析。 方法：以10位大專男子羽球校隊選手為受試者，由10台紅外線攝影機 (240 Hz) 及一塊 AMTI 測力板 (2400 Hz) 組成動作分析系統，擷取15顆反光球所建立的足踝關節模型剛體，以及人體測試時的地面反作用力參數。資料收集不同方向的網前跨步動作3次，以成對樣本t檢定比較各組的差異及重複量數二因子變異數分析。 結果：赤足與穿著羽球鞋於不同方向的跨步動作時，赤足腳後跟垂直及水平方向的最大負荷率，大於穿著羽球鞋且達顯著差異(p < .05)；赤足拇趾關節的蹠屈到背屈角度，大於穿著羽球鞋且達顯著差異( p<. 05)。運動學分析時，往前及向右正手拍方向的足部動作未達顯著差異。 結論：本研究探討足部與踝關節的動態模式特性，赤足的足部拇趾比穿著羽球鞋有較多的活動情形，對於不同肢段之間的蹠屈到背屈動作有其關連性。因此，提供羽球鞋功能設計，對於足踝動作的預防傷害及改善以達最佳表現之參考。

PURPOSE: The aim of this study was to investigate the differences of foot kinematics and kinetics between barefoot and badminton shoes in performing multidirectional lunges. METHODS: Ten male collegiate badminton players were recruited for this study. The foot motion was examined using a 3D motion analysis system. The motion analysis system consists of 10 infrared cameras and an AMTI force plate. The infrared cameras at a frequency of 240 Hz were used for detecting 15 reflective markers and tracking their trajectories to establish an ankle joint model; the AMTI force plate was used to measure ground reaction forces at 2400 Hz. The data of 3 lunges in 3 different directions were collected and analyzed based on the paired t-test statistical analysis and repeated measurement 2-way ANOVA. RWSULTS: It is shown that there were significant differences when performing multidirectional lunges with both barefoot and badminton shoes. This result was found to be significantly higher in the maximum vertical and horizontal loading rates of the heel, and higher in the metatarsal joint angles from dorsiflexion to plantar flexion with barefoot than with badminton shoes (p < .05). On the other hand, from the aspect of kinematics, both barefoot and badminton shoes did not show significant differences in the foot movement patterns of forward steps and right forehand steps. CONCLUSIONS: In badminton, a lunge is considered to be an advanced skill and can be critical for success. This study investigated the dynamic lunge movement patterns of the foot and ankle. The motion of metatarsal joints, in relation to the motion of other segments from dorsiflexion to plantar flexion, was more active barefoot than in badminton shoes. Our study provides solid scientific evidences for the future design of badminton shoes that may prevent injuries and enhance performance.