Análise eletromiográfica da sobrecarga postural causada pelo colete balístico em profissionais de segurança pública

Abstract

The working situations that a military police officer is exposed demand postural patterns that overload the muscle-skeletal structures leading to lower back pain. During the military police activity the individuals who take part in the operational activity spend 12 hours in a row wearing mandatory safety equipment, that can weight up to 5.7 kg, this function singularity along with sitting position inside the patrol car may lead to an overload on the spine. The objective of this work was to verify the neuromuscular response through electromyography in operational military police officers before and after the working shifts. 44 male subjects have been evaluated, with an average of 34.59±8.05 years of age. The protocol used consisted in the evaluation of the paravertebral muscles and abdominal rectus in a maximum contraction test (CIVM) in the extension movement of the upper body. And yet, the Roland-Morris’ functional evaluation questionnaire and the Corlett and Manenica’s painful areas diagram were used. A previously set 16-channel electromyograph has been used. The signal were processed in the temporal (midline of energy) and spectral domain (midline of frequency), using the computer software MatLab®. Shapiro-Wilk statistical tests and Wilcoxon Signed Ranks Test were applied the analysis were carried out through the software SPSS v21.0 and Microsoft Office Excel 2010 considering as significance level p<0.05. The results showed differences in statistics after work in temporal analysis, a decrease in EMGME in the rectus abdominis muscle (p = 0.016) and in the sample stratified by age, with subject over 31 years of age, (p = 0.016), spectral analysis, reduction in EMGFM in the iliocostalis right (p = 0.027) and right and left sides in stratified sampling, in subject with more than 31 years of age and with more than 10 years of service , 50% of the assessed level 4 noted the painful areas and diagram on the Roland-Morris questionnaire, significant differences were found in subjects with more than 10 years of service. The protocol used showed a decrease in the amplitude of the electromyographic signal as well as a possible muscle fatigue on the side where the cops usuallytheir guns after the military police work well as postural discomfort on thoracolumbar region and change the functionality of the column due to complaint algic in the sample studied.