Effect of Muscle Length on Fatigue Induced by Low Frequency Current Stimulation in Human Medial Gastrocnemius Muscle

2016-05-10T16-43-04Z
Source: International Journal of Therapies and Rehabilitation Research
Tarek Mohamed El Gohary, Sameh Refaat Ibrahim, Waleed Salah Elddin Mahmoud, Hatem Ahmed Emara, Mostafa Saber Ahmed.
Abstract: Background: Muscle force is affected by many factors including muscle length. The exact mechanism of the effect of muscle length is not fully understood. Objective: to determine if motoneuron discharges accommodate changes imposed by changing Medial gastrocnemius muscle length following electrically fatiguing protocol. Methods: Randomized clinical trial was conducted on 60 untrained subjects aged (20-40 years) in isokinetic & electromyography lab of Faculty of Physical Therapy in august 2014. Both fatiguing short length group (FS) and fatiguing long length group (FL) underwent low frequency electrically fatiguing protocol. Main Outcome Measures: Outcome measures obtained pre and post the fatiguing protocol were the compound muscle action potential. Results: there were no significant difference between pre outcome measures in both groups (p= 0.837) and post outcome measures in both groups (p= 0.119). Significant main effects of fatigue were observed in both groups (p= 0.0001). Significant main effects of muscle length were observed between post measurements of fatiguing short length group and post measurement of fatiguing long length group. Conclusion: Fatigue has been shown to be greater at long muscle lengths than at short muscle lengths following low frequency current fatiguing protocol.


from Scope via xlomafota13 on Inoreader http://ift.tt/21UlM6W
via IFTTT