Quadriceps muscle torque response to different pulse durations of neuromuscular electrical stimulation / Hend Hassan Abdullah Def Allah ; Supervised Haytham Mohamed Elhafez , Amira Hussein Deraz

Thesis (M.Sc.) - Cairo University - Faculty of Physical Therapy - Department of Basic Science

Background: Neuromuscular electrical stimulation (NMES) is an effective therapeutic technique for strengthening weak muscles in patient populations. Torque is a turning or rotator force which equal to the product of a force and the perpendicular distance from the line of action of the force to the axis of rotation. Pulse duration Is the interval between the time, during the first transition, that the amplitude of the pulse reaches a specified fraction (level) of its final amplitude, and the time the pulse amplitude drops, on the last transition, to the same level?. Purpose: To investigate the effect of different pulse durations of neuromuscular electrical stimulation on the torque of quadriceps femoris muscles. Methods: Thirty normal subjects from both sexes with age ranged from 25-30 years were participated in this study. They are assigned randomly and equally to three groups. Group A received 50 æs, Group B received 200 æs and Group C received 600 æs. Knee extensor peak torque was measured pre and post treatment by isokinetic dynamometer. Each subject{u2019} group received 3 sessions per week for four weeks. Results: Maximum isometric voluntary contraction was increased significantly at 600 æs (70.1±11.82) than at 200 æs and 50 æs. On the other hand, peak current was significantly decreased at 600 æs (-89.33 and -74.69) than at different pulse durations for 50 æs and 200 æs respectively. Conclusion: Pulse duration at 600 æs will produce maximum tolerated torque, while pulse duration at 600 æs will produce minimum peak current

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