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Date of Award


Degree Type

Thesis (On-Campus Access Only)

Degree Name

Master of Physical Therapy (MPT)

First Advisor

Kenneth W. Bush, PhD, PT

Second Advisor

Daiva A. Banaitis, PhD, PT


The purpose of this study was to examine which neuromuscular electrical stimulation (NMES) ON:OFF time of a 1:3 duty cycle would result in the least amount of muscle fatigue. Seventeen subjects ranging in age from 20-27 received 3 different NMES ON:OFF times in three separate testing sessions' A counterbalanced testing order was used to determine the ordering of the 5:15, 10:30, and 15:45 stimulus times. Testing was performed on an isometric dynamometer (Cybex) which transmitted the NMES elicited extension torques to a computer program for analysis. A 3 level repeated measures ANOVA was used to determine the effect of the 3 stimulus ON:OFF times on muscle fatigue. The results showed that the onset of muscle fatigue required significantly less time with the application of the 15:45 stimulus time than either the 10:30 or 5:15 stimulus times (p < .05). The 10:30 stimulus time was also found to require significantly less time than the 5:15 stimulus time (p < .05). These results indicate that the onset of muscle fatigue is significantly related to the length of stimulus ON time.


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