Manns A, Miralles R, Palazzi C
J Prosthet Dent. 1979 Dec;42(6):674-82. doi: 10.1016/0022-3913(79)90200-2.
The relation EMG activity, bite force, and muscular elongation was studied in eight subjects with complete natural dentition during isometric contractions of the masseter muscle, measured from 7 mm to almost maximum jaw opening. EMG was registered with superficial electrodes and bite force with a gnathodynamometer. In series 1, recordings of EMG activity maintaining bite force constant (10 and 20 kg) show that EMG is high when the bite opening is 7 mm, decreases from 15 to 20 mm, and then increases again as jaw opening approaches maximum opening. In series 2, recordings of bite force maintaining EMG constant show that bite force increases up to a certain range of jaw opening (around 15 to 20 mm) and then decreases as we approach maximum jaw opening. Results show that there is for each experimental subject a physiologically optimum muscular elongation of major efficiency where the masseter develops highest muscular force with least EMG activity.
在八名天然牙列完整的受试者中，研究了咬肌等长收缩过程中肌电图（EMG）活动、咬合力和肌肉伸长之间的关系，测量范围为从7毫米到几乎最大张口度。使用表面电极记录EMG，使用咬力计测量咬合力。在系列1中，保持咬合力恒定（10和20千克）的EMG活动记录显示，当咬口为7毫米时EMG较高，从15毫米到20毫米时降低，然后随着张口接近最大张口度再次升高。在系列2中，保持EMG恒定的咬合力记录显示，咬合力在一定的张口范围内（约15至20毫米）增加，然后随着接近最大张口度而降低。结果表明，对于每个实验对象，都存在一个生理上最佳的肌肉伸长状态，此时咬肌以最小的EMG活动产生最高的肌肉力量，效率最高。
