سیدحسن حسینی

۱۲ healthy male students (۲۰-۲۸ years old) of Allameh Tabatabai University were selected according to the inclusion criteria and available sampling method. Electromyographic activity of internal, extensor, extensor, and medial sciatic muscles (VM, VL, TFL, and Gmed during single-leg squat movement was recorded at ۳ different downhill angles (neutral, ۱۰ °, and ۲۰ °). Lower limb kinematics at the frontal level were analyzed using a digital video camera to produce two-dimensional kinematic images by Kinova software. Single-legged squat on a board with a slope of ۱۰ degrees reduces the angle of the knee joint in the direction of the slope of the board (sagittal plate) or the same as knee flexion, but in the frontal plate means the reduction of femur and iliac knee by changing the slope. The joint angle is not visible. Also, the four target muscles (medial extensor, external extensor, extensor and medial serine) showed a significant increase in muscle electromyography activity at a ۱۰-degree slope of the board, with the only difference being that the internal extensor muscle also increased at a ۲۰-degree incline. It had significant activity compared to the zero degree slope (there was not much difference between the ۲۰ and ۱۰ degree slopes of the board) but in the other three muscles the electromyographic activity at the ۲۰ degree slope in addition to the ۱۰ degree slope was not significantly different from the zero degree slope.