Jaw movement tremor as a predictor of chewing performance.
Jaw movement tremor as a predictor of chewing performance.
复制标题
下颌运动震颤作为咀嚼性能的预测指标。
作者：
R. Wilding;M. Shaikh
本研究的目的是调查正常的生理性震颤在下颌运动的因素，可能会影响咀嚼性能更直接的肌肉活动或下颌位移。根据15次咀嚼行程后食物颗粒尺寸的减小来定义咀嚼性能。咀嚼颗粒大小和肌电图活动的数据可从早期研究的24个无症状的成年人。咀嚼过程中的下颌运动记录使用electrognathography，并在三个平面的速度和加速度进行了测定。在咀嚼周期的打开和关闭阶段计算加速度的功率谱。功率谱中的峰值振幅的频率代表下颌的生理性震颤。在咀嚼周期的开放和关闭阶段的震颤频率是咀嚼性能的强有力的预测因素。由来自加速度的变量以及肌电图和下颌运动变量组成的多变量模型产生了能够预测咀嚼性能的多变量模型，调整后的R2值为0.78。
The purpose of this study was to investigate normal physiologic tremor in jaw movement as a factor that may influence chewing performance more directly than either muscle activity or jaw displacement. Chewing performance was defined in terms of the reduction in food particle size after 15 chewing strokes. Data on chewing particle size and electromyographic activity were available for 24 asymptomatic adults from an earlier study. Jaw movements during chewing were recorded using electrognathography, and velocity and acceleration in three planes were determined. Power spectrum for acceleration was calculated during opening and closing phases of the chewing cycle. The frequency of the peak amplitude in the power spectrum represented physiologic tremor of the jaw. Tremor frequencies during both opening and closing phases of the chewing cycle were strong predictors of chewing performance. A multivariate model composed of variables derived from acceleration, together with electromyographic and jaw movement variables, produced a multivariate model that was able to predict chewing performance with an adjusted R2 value of .78.