Wang K, Ueno T, Taniguchi H, Ohyama T
Department of Maxillofacial Prosthetics, Life Science of Maxillofacial Systems, Dental Research Division, Tokyo Medical and Dental University, Japan.
Bull Tokyo Med Dent Univ. 1996 Mar;43(1):1-12.
Many studies have been performed on the mandibular orthopedic repositioning appliance (MORA) as an athletic performance enhancer since the late 1970s. The concept that changing the mandibular position would increase the strength and improve the performance of subjects has been a source of controversy among various researchers. The strength of shoulder abduction and electronic activities of six muscle groups in the upper body were tested on seven subjects in this study. The normalized data for four different situations: rest position, MVC (Maximum Voluntary Contraction) in an intercuspal position, MVC with placebo, and MVC with MORA in supported rest position were analysed. Statistical analysis demonstrated that the MVC with MORA was significantly stronger than the rest position for upper appendage strength. The electronic activities of all muscle groups were significantly greater with MORA than those in rest position, and some of them were significantly greater with MORA than with either MVC or placebo situation. THe results suggested that the muscle activities of the upper appendage were increased by biting MORA in the supported rest position during the shoulder abduction performance.
自20世纪70年代末以来，人们对下颌矫形复位矫治器（MORA）作为一种提高运动表现的器械进行了大量研究。改变下颌位置会增强受试者力量并改善其表现这一概念，在不同研究人员之间一直存在争议。本研究对7名受试者的肩部外展力量以及上半身六个肌肉群的电活动进行了测试。分析了四种不同情况下的标准化数据：休息位、牙尖交错位的最大自主收缩（MVC）、使用安慰剂时的MVC以及在支撑休息位使用MORA时的MVC。统计分析表明，在支撑休息位使用MORA时的MVC，其上肢力量明显强于休息位。使用MORA时，所有肌肉群的电活动均显著高于休息位，并且其中一些肌肉群使用MORA时的电活动显著高于MVC或安慰剂情况。结果表明，在肩部外展表现过程中，于支撑休息位咬住MORA可增加上肢的肌肉活动。
