The ideal functional electrical stimulation (FES) system requires a mathematical model to provide feedforward control of the stimulation parameters such that they are optimal for different individuals across a range o...
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The ideal functional electrical stimulation (FES) system requires a mathematical model to provide feedforward control of the stimulation parameters such that they are optimal for different individuals across a range of physiological condi tions, muscles, and tasks. Recently we tested and validated such a model using a ble-bodied subjects. The purpose of this study was to determine whether this mo del applied to persons with spinal cord injuries (SCI). To this end, the isometr ic force responses of the paralyzed quadriceps femoris muscles of 14 adolescents and young adults were tested. For each subject, the force responses to two six -pulse stimulation trains were used to identify the parameter values of the mod el and then the model was used to predict the force responses to three train pat terns across a range of frequencies in both a nonfatigued and fatigued condition . The intraclass correlation coefficients (ICCs) between the experimental and pr edicted force-time integrals and peak forces were above 0.90 for 12 of the 13 s timulation trains tested in the nonfatigued condition and all 13 trains tested i n the fatigued condition. The success of our model with SCI subjects leads us to believe that our model may be useful for designing optimal stimulation paramete rs for standing and ambulation in patients who use FES.
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