Research On The Surface Electromyographic Characteristics Of Human During Long Time Working At Desk

With the change of life style, worktime of people at desk becomes longer and longer in modern time. Long worktime at desk will lead to exhausted, which will increase the morbidity rate of lumber vertebra and cervical vertebra. Thus it is significant to make a research of muscle’s condition working for a long-time at desk. In this paper, I mainly make a research of the SEMG characteristics of humen neck shoulder and back musle working for a long time at desk.This research is to collect the SEMG of the healthy and the waist sick working for a long time at desk by JE-TB0810. Chosen muscles contain neck extensor, trapezius, erector apinae and latissimus dorsi. The subjects were asked to sit in the normal working environment for two hours. The data of subjects were collected at each 15 minutes and the subjects make a subjective evalution based on fatigue conditon. The purpose is to make the gender and symmetrical difference analysis of neck, shoulder and back muscle among the healthy and the difference of healthy and the waist sick people by AEMG(Average EMG), IEMG(Integral EMG), MPF(Mean Power Frequency), meanwhile make analysis of the neck, shoulder and back muscle fatigue condition followed time. Select proper SEMG characteristics as input vector by making correlation analysis of ARV(Average Rectified Value), SSC(Slope Sign Change), WL(Wave Length), MPF(Mean Power Frequency), ZC(Zero Crossing) and subjective evaluation, then establish humen fatigue model by support vector machine based on the slected vector and objective evaluation.As anlyzed above, it is concluded that the neck, shoulde and back muscles’ fatigue time of the healthy male, the healthy female and the waist sick people woking at desk based on the analysis of humen neck, shoulder and back muscles’ SEMG. The fatigue time of the healthy male is 45 to 80 minutes, the fatigue time of the healthy female is 50 to 75 minutes, the fatigue time of the waist sick is 50 to 65 minutes. There are some difference between different muscle of fatigue time. Establish the fatigue model of both-side neck extensor, trapezius and erector apinae of the healthy and trapezius and left side erector apinae of the waist sick.The conclusion can apply to the monitor of muscle condition and the prevention of the wait sick. The established model can apply to the future and assist in medical diagnosis.