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Stimulus Frequency-Force Relation in Muscle Model for FES Applications

Computer simulations of FES-induced motions help generating stimulation data and modifying it without applying the stimulation to patients. Musculoskeletal model having characteristics of electrically stimulated muscle is required for this purpose. Stimulus frequency dependence of muscle contraction is important as well as recruitment characteristics. In this paper, stimulus frequency-force relation is modeled. Parameters of this model can be estimated by simple experiments. The model can represent the difference between electrically stimulated fast and slow type muscle properties. The stimulus frequency-force model is applied to prediction of the relation of human muscles. The stimulus frequency-force relation can be used in muscle model to describe summation level of muscle contraction by electrical stimulation. Muscle model controlled by stimulus frequency along with stimulus intensity will be useful in generation of stimulation data and studying control method because stimulus frequency control has the ability to make better control of FES-induced motions.