The effectiveness of progressively increasing stimulation frequency and intensity to maintain paralyzed muscle force during repetitive activation in persons with spinal cord injury |
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Authors: | Chou Li-Wei Lee Samuel C Johnston Therese E Binder-Macleod Stuart A |
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Institution: | a Biomechanics and Movement Science Program, University of Delaware, Newark, DE b Department of Physical Therapy, University of Delaware, Newark, DE c Research Department, Shriners Hospitals for Children, Philadelphia, PA. |
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Abstract: | Chou L-W, Lee SC, Johnston TE, Binder-Macleod SA. The effectiveness of progressively increasing stimulation frequency and intensity to maintain paralyzed muscle force during repetitive activation in persons with spinal cord injury.ObjectiveTo compare the effectiveness of progressively increasing stimulation intensity, progressively increasing frequency, or progressively increasing both frequency and intensity on paralyzed quadriceps femoris muscle force maintenance during repetitive activation.DesignFactorial design with different stimulation protocols as independent variables.SettingA muscle performance laboratory.ParticipantsPeople (N=8) with spinal cord injury (SCI) (age, 14.63±1.77y).InterventionsNot applicable.Main Outcome MeasureNumber of contractions when the peak force was 90% or more of a subject's maximal twitch force.ResultsThe protocol involving progressively increasing stimulation intensity and then frequency generated more successful contractions (189.88±53.33) than progressively increasing the frequency followed by intensity (122.75±26.56 contractions). Regardless of the order, progressively increasing both intensity and frequency generated more successful contractions than progressively increasing intensity (97 contractions) or frequency (62 contractions) alone.ConclusionsOur findings suggest that during repetitive electric activation, progressively increasing both stimulation frequency and intensity can produce more successful contractions than progressively increasing only frequency or intensity. These findings can help researchers and clinicians design more effective stimulation protocols for persons with SCI during functional electric stimulation applications. |
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Keywords: | Electric stimulation Rehabilitation Spinal cord injuries |
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