Department of Biomechanics, Faculty of Physical Therapy, Cairo University, Egypt
Online published on 1 October, 2011.
To determine the chronic effect of static stretching program of hamstring on knee flexors concentric torque.
Twenty four volunteers male participants (age = 24.08 ± 2.6 years, height 171 ± 5.6 cm, weight = 66.5 ± 5.8 kg). The participants performed a 30 sec static stretch for 6 weeks (three times/week). The knee extension range of motion (ROM) and hamstring concentric torque was measured before and after the static stretching program, ROM measured by universal goniometer. The hamstring concentric torque was evaluated by Biodex Multi-joint System 3, measurements performed at angular velocities 30° and 60°/sec.
Statistical analysis revealed significant increase in the concentric hamstring torque at angular velocities 30° and 60°/sec, also there is significant increase in the ROM due to static stretch.
Static stretching program for the hamstring muscle was effective in increasing the concentric torque of the knee flexors at both angular velocities, also, induced increases in the amplitude of knee extension.
Hamstring flexibility, Static stretch, Concentric contraction
