背景與目的：跳舞機結合電腦與電玩的效應，近年來蔚為風行。然而有關跳舞機可能伴隨之危險卻乏人探討，至今尚未有人量化其相關衝擊與受力，更沒有人針對其使用方法進行探討。本研究目的在針對一般家用電腦跳舞機，量化熱舞過程衍生之瞬間衝擊力。同時利用泡棉地墊之固定，檢定改善舞蹈地面能否減輕瞬間衝擊量。方法：利用三軸向加速規針對17位健康大學生測量其於難易不同兩首舞曲下產生之衝擊受力，以取得瞬間衝擊量與衝擊頻率。受試者並在外加泡棉地墊的情況下進行相關衝擊測量。最後以雙向變異數分析法檢定舞曲難度與泡棉地墊對相關衝擊所產生的影響。結果，難度較高的次級舞曲所生之衝擊量與頻率均顯著高於初級舞曲(p<0.05)，然而有沒有外加泡棉地墊並未造成顯著之衝擊差異。結論：跳舞機運動可歸類於高衝擊舞蹈，舞曲難度愈高所產生的瞬間衝擊量與頻率愈高。於中低難度舞曲使用2公分厚泡棉地墊未能有效吸收震盪，跳舞機玩家在盡情享受熱舞之餘仍應提高警覺，才能減少受傷機率。

Background and Purposes: High-impact dance has been widely related to a variety of musculoskeletal injuries in the lower extremities and the lower back. Biomechanical analysis has been applied to different dance exercises However, little studies have addressed the effect of dance machine exercise. The purposes of this paper were (1) to quantify the impacts developed during dance machine exercises and (2) to examine the effect of mattress usage on the impulsive load in dance machine exercises. Methods: 50 healthy subjects were recruited for dance machine training. Two dances in different difficulty were provided for training (level 1, L1/level 2, L2). Subjects completing the training were arranged to undertake average impact measurements during L1 and L2 dance. A triaxial accelerometer (Kistler. NY) was applied at the medial tibial plateau of left leg for impact measurements. The measurements were performed on concrete floor with or without a 2 cm mattress. The peak amplitude of the impacts that resulted from all dance steps in a whole dancing trial was collected and averaged for each trial in each floor condition. A two-way ANOVA was conducted to examine the effect of dance level and mattress on the average impacts developed in dance machine exercises. Results: Significant differences in average impacts were found in dancing at different difficulty (dance on the mattress L1: 3.1±1.0g, L2: 3.9±1.6g, p<0.05; dance on the floor, L1: 3.1±1.2g, L2: 3.9±1.5g, p<0.05). How ever, no significant differences were found in average impacts between dancing with a mattress and without a mattress. Conclusions: High Impact loading was found to be developed during dance machine exercises. L2 dance tended to exhibit significantly higher impact loading than L1 dance .However, the impacts remained insignificantly different, no matter during dancing directly on the concrete floor or on a mattress. It is suggested to limit the duration of dance machine practice or to dance with less heavier steps even when a 2 cm mattress is used.