Análise eletromiográfica da atividade muscular de membros inferiores em diferentes posições angulares de joelho durante o andar a cavalo: estudo premilinar

Abstract

The main objective of this study was to compare muscle activity of the lower limbs and erector spinae in relation to changes in knee angle positions caused by variations in stirrup positions during horseback riding, as well as comparing them to a reference position of sitting on a chair on the ground. Nine healthy volunteers aged 19 to 23 years old were evaluated. Surface electromyography was used to measure muscle activity while on horseback in three different positions of the leg with internal knee angles (P1=60º, P2=90º, P3=120º) and it was compared to the reference position of sitting on a chair (RP). Rectus femoris (RF), vastus lateralis (VL), tibialis anterior (TA), gastrocnemius (GA), soleus (SO) and lumbar erector (LE) were analyzed. The EMG values were obtained in the period of eight seconds. They were collected in three trials for each subject using the same horse in all the positions using Root Means Square (RMS) and normalized by the reference position. Shapiro-Wilk test was used in order to test the normality of the data. ANOVA was used to compare the averages, followed by Duncan’s Post-Hoc test to identify where the differences occurred. Statistical software Statistica Analysis System, version 9.2 was used. The results showed that there is difference in muscle activation in horseback riding positions compared to the reference position. Significant differences in muscle activity in relation to the variations in knee angles while on horseback were not significantly confirmed.