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

Purposes : to investigate the effect of fatiguing protocol of high and low frequency on compound action potential (CMAP) of medial Gastrocnemius muscle over timeStudy Design : (2 x 1) pre - Test post - Test designMaterials and methods : sixty healthy male subjects from were involved , aged between 18 - 40 yearsThey were divided into two equal groupsSubjects in the first group underwent 80Hz frequency stimulation while Subjects in the second group underwent 40Hz frequency stimulationSubjects were required to tolerate a fatiguing protocol for 20 minutesMeasurement The amplitude CMAP were measured pre - test , immediately post - test and over interval of 10 , 20 , 40 minutesResults : There were significant decrease in the amplitude CMAP of medial Gastrocnemius muscle following high and low frequency stimulation protocolThere were no significant differences between high and low frequency stimulation on the amplitude of CMAPDiscussion : Subjects who underwent high frequency stimulation (80 Hz) shows rapid fall in the amplitude of CMAP rather than subjects in low frequency stimulationFurthermore , subjects in group II , the decline in CMAP amplitude comes late after 20 minutes for a littleextentnd resume to the pre - test value after 40 minutesConclusion : Decline in the amplitude of CMAP do exist between individuals before and after high and low frequency stimulation (fatiguing protocol) It was recommended to use low frequency stimulation rather than high frequency stimulation to avoid rapid fatigue of the muscle

Issued also as CD