Study On Muscle Fatigue And Walk By Surface Electromyography

Purpose: (1). To explore the variability of sEMG parameters, (2). To probe into the reliable parameters of evaluation on the muscle fatigue and the regularity of spectrum and amplitude by using SEMG, (3). To seek out the assessment method of gait analysis by utilizing SEMG, lay the reliable foundation for extending clinical application of it.Method: (1). A healthy examinee took knee joint isometric contraction; four others took 10m free walking. SEMG signals were recorded respectively from their correlative lower limbs muscles. The coefficient of variation of each parameter was investigated. (2). The healthy young examinees performed isometric ramp contractions in knee extension with the force gradually, the test of increasing load initially and descending subsequently, and the fatigue test , SEMG signals were recorded respectively from their bilateral vastus medialis. The variational regularity of each parameter was investigated. The experimental data's analysis of curve estimation and nonlinear regression was made. (3). The healthy young examinees performed 10m free walk test. 2 hemiplegic patients, 4 foot drop patients with and without AFO did 10m free walk test in turn, SEMG signals were recorded from their bilateral TA and MG The variational regularity of each parameter within every gait cycle was analysised. The T test of spectrum and amplitude indexes' for the fore-and-aft tested muscles was investigated. The work-loading of IEMG, RMS was also analysised.Result: (1). For the static contraction, the coefficient of variation of each parameter was less than 0.150 except for AEMG, even if the analytic duration short as 1 second. For the dynamic walking exercises, the averaged CV of MF, MPF was about 0.100,that of ZCR and AEMG was 0.150 or so. (2). For the antrorse recruitment test and the adverse one, the estimative curve optimum of each parameter with MVC% or testing duration is all cubic. For the fatigue test of bilateral vastus medialis, the estimative curve optimum of each SEMG parameter with testing period of time is all cubic. (3). During the normal gait cycle, TA is almostly in continuous athlete state. There are two active peaks of TA, and there is a lesser spindal at the midswing(telophase). The activity's duration of TA is far longer than that of MG While the healthy man walking, the myoelectrical activity of TA is different...