Surface slope enhances anterior muscles fatigue in lower limb

Abstract

In this human study, the effect of slopes changes of motion surface on four muscles fatigue of lower limb was investigated by surface electromyography. Zero, 10 and 20 degree slopes of a treadmill with constant speed of 5 km/h were used. Seven mature men were selected. Each man as walked on the treadmill at each slope for five minutes time. Then, muscles signals were recorded before and after walking on treadmill by surface electromyography. Time period of between tests for each person on different slopes of treadmill was 48 hours. It was revealed that between fatigue rate of muscles, at zero degree slope, was not significantly different (P>0.05). But, at 10 degree slope, between fatigue rate of Tibialis and others was significantly different (P<0.05) and was increased. Also, at 20 degree slope, between fatigue rate of Quadriceps and others was significantly different (P<0.05) and was increased too. It is concluded that slope changes of motion surface can increase anterior muscles fatigue of lower limb. [Behzad Yasrebi, Karim Leilnahari, Seyed Esmaeel Hashemi-Aghdam, Mir Hamid Salehian. Surface slope enhances anterior muscles fatigue in lower limb. Life Sci J 2012;9(4):1410-1412] (ISSN:1097-8135). http://www.lifesciencesite.com. 214