CORRELATION BETWEEN AUTOREGRESSIVE MOVING-AVERAGE MODEL PARAMETERS OFELECTROMYOGRAM OF HUMAN JAW-CLOSING MUSCLES AND MAXIMUM CLENCHING TIME AT INTERCUSPAL POSITION

During maximum clenching in the intercuspal position, surface electrom yograms of left masseter and anterior temporal muscles were sampled in 16 healthy subjects with natural dentitions to establish a four-order , autoregressive (AR) moving-average (MA) model of the myoelectrical s ignals. The correlation coefficients and the linear regression between the model parameters and the clenching time were calculated. The mode l parameters had the positive or the negative correlation, and AR mode l parameters had the higher correlation than MA model parameters. The model parameters relate to muscular fatigue and the slope of the regre ssive equation relates to the endurance time of the isometric contract ion.