Avaliação da lesão nervosa periférica por meio da eletromiografia de superfície

Abstract

Peripheral Nerve lesions (LNP) interfere and impair the capacity of the patient. The break in the continuity of the structure of peripheral nerves results in blocking the propagation of nerve impulses, affecting motor skills, sensory and causing a disruption of activities functional.A posttraumatic regeneration is complex and the individual can stay with sequelae (Rosén and Lundborg 2007). The objective is to point out possible differences in muscle characteristics after the LNP. Participated effectively this research 24 volunteers, divided into two groups, one group of volunteers With Injury (GCL) (n = 4) and a group of volunteers No Injury (GSL), divided into two GSL groups of men (n = 10) and the GSL Women (n = 10). Volunteers with injury underwent an assessment of physical therapy clinical trials. The 24 volunteers spent the EMG evaluation surface, which consisted of wrist extension task, analysing the activite of muscles Extension Radial Carpal and Extension Ulnar Carpal, pulling a load cell. It was extracted three characteristics from EMG signal: RMS, Medium Frequency (FM) and Median Frequency (FMD). By comparing the qualitative clinical evaluations strength, the quantitative analysis with the load cell was considerably effective for presenting difference in comparison of the injured limb having lower resultant force. In the evaluation of the volunteers with injury variables extracted from the EMG signal was not possible to observe a characterization according to the time of injury. In the statistical analysis the No Injury group, the comparison between the dominant member versus non-dominant limb there has been no difference. According to the comparison of the GCL and GSL volunteers with lesions showed a trend towards higher frequency values, but the statistical analysis there was no significant difference between groups. Biggest FM and FMD values may indicate a predominance of type II fibers, caused by cross post reinnervation, genetic factors, functional demands and individual variations can also change muscle recruitment (Fugl-Meyer, ERIKSSON et al. 1982). However these findings that show no difference in comparisons of myoelectric activity which may indicate that these post LNP volunteers have acquired good recovery due to successful treatment.