| Summary: | 碩士 === 國立成功大學 === 體育健康與休閒研究所 === 97 === Aerobic dance has become a popular exercise in the past decades. The reason why the aerobic dance is popular is that aerobic dance benefits us both physically and mentally. Nonetheless, there appears to be a growing concern about clinical injury problems caused by aerobic dance activity. Studies of aerobic dance injuries have indicated the most frequent injuries occurring to the lower extremity by overuse. Up to now, the mechanism and risk factors to lower extremity injury in aerobic dance haven’t been well identified nor proved. In the previously biomechanical studies about aerobic dance, most of the surveys focused on impact caused by ground reaction force, but the information on joint loading was limited. The aims of the proposed research are to evaluate: 1) the effects of different levels of impact on the joint kinematics and kinetics of lower limb; 2) the joint kinematics and kinetics in four different basic movements. The motion capture system will be used to register the landmark’s trajectories of human body when step aerobic dance is performed. The methodology involves motion performance analysis using retro-reflective markers. Nineteen retro-reflective markers will be placed on selected anatomic landmarks to define the coordinate system of pelvis, thigh, shank and foot. The ground reaction forces of each foot will be measured by the use of force plates. The results showed that there were significant differences on the joint angle, joint force and joint moment between high impact and low impact (p<.05). The joint force in mambo movement was the smaller than the other three movements, and the ankle lateral force in L step movement was 0.9-1.7 N/kg larger than others during low impact. The knee anterior force in kick was lower than leg curl and L step movements duing low impact. And the movement of L step needed adductors to maintain balance. In the mambo movement of high impact, there were ankle inversion and maximal ankle inversion moment at the step ascent phase. Hip flexor, knee extensor and ankle dorsiflexor were higher in leg curl and kick movement than in the other two movements. The aerobic instructors should emphasize the training of hip adductors, quadriceps, hamstring, plantarflexors, dorsiflexors and ankle inversion muscles. The beginners and those who have musculoskeletal problem ought to avoid learning movement of high impact mambo at the beginning but learn movement of low impact kick and mambo first.
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