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KMID : 1140920180420020250
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Annals of Rehabilitation Medicine
2018 Volume.42 No. 2 p.250 ~ p.259
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Effects of Very High Stimulation Frequency andWide-Pulse Duration on Stimulated Force andFatigue of Quadriceps in Healthy Participants
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Rongsawad Kitima
Ratanapinunchai Jonjin
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Abstract
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Objective: To determine the effect of very high stimulation frequency (150 and 200 Hz) with wide pulse durationversus 50 Hz with wide pulse duration on stimulated force and fatigue of quadriceps femoris in healthyparticipants.
Methods: Thirty-four healthy participants underwent fatigue test using three stimulation frequency conditions (50,150, and 200 Hz) with pulse duration of 0.9 ms. Normalized force values at the end of each fatigue protocol andcurve fitting patterns were compared among stimulated frequencies.
Results: Very high stimulation frequency (150 and 200 Hz) conditions showed a trend of having more decline innormalized stimulated force during fatigue test compared to a low stimulation frequency at 50 Hz. However, thedifference was not statistically significant. Responder group showed the same slope of a linear fitting pattern,implying the same pattern of muscle fatigue among three stimulation frequency conditions (-3.32 in 50 Hz, -2.88in 150 Hz, and -3.14 in 200 Hz, respectively).
Conclusion: There were high inter-subject variations in the response to different frequency stimulation conditions.However, very high stimulation frequency generated the same fatigue pattern as the low stimulation frequency inthe responder group. Further research is needed to explore the mechanism involved.
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KEYWORD
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Electrical stimulation, Muscle fatigue, Quadriceps muscle, Muscle contraction
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