Dynamic optimization of stimulation frequency to reduce isometric muscle fatigue using a modified Hill‐Huxley model

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Abstract
Introduction: Optimal frequency modulation during functional electrical stimulation (FES) may minimize or delay the onset of FES‐induced muscle fatigue.Methods: An offline dynamic optimization method, constrained to a modified Hill‐Huxley model, was used to determine the minimum number of pulses that would maintain a constant desired isometric contraction force.Results: Six able‐bodied participants were recruited for the experiments, and their quadriceps muscles were stimulated while they sat on a leg extension machine. The force–time (F–T) integrals and peak forces after the pulse train was delivered were found to be statistically significantly greater than the force–time integrals and peak forces obtained after a constant frequency train was delivered.Discussion: Experimental results indicated that the optimized pulse trains induced lower levels of muscle fatigue compared with constant frequency pulse trains. This could have a potential advantage over current FES methods that often choose a constant frequency stimulation train.Muscle Nerve57: 634–641, 2018
Funding Information
  • National Science Foundation (1462876, 1511139)
  • National Institutes of Health (1R03HD086529‐01)

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