Predicting the effect of pulse duration on fatigue during electrical stimulation

M. Susan Marion, Maury L. Hull, Anthony S. Wexler

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Pulse characteristics should be considered when predicting the optimal stimulation strategy to minimize fatigue during Functional Electrical Stimulation. Our previous mathematical model of non-isometric muscle fatigue accounted for the effect of applied load, but not the effect of pulse duration. Therefore, our objectives were to: 1) further develop our model of non-isometric fatigue and 2) experimentally validate the model. A computer-controlled stimulator sent electrical pulses to surface electrodes on the thighs of 25 able-bodied human subjects. Isometric and non-isometric non-fatiguing and fatiguing leg extension ankle forces and/or knee angles were measured. The independent variable was pulse duration (170, 200, 250, 400, and 600 μs) and the dependent variables were angular excursion, velocity, and train duration. The model was fit to measurements from 13 subjects. The equation for one fatigue model parameter was modified. Two other fatigue model parameters were unnecessary and removed. The modified parameter is a function of other parameters within the model. To validate the model, we predicted fatigue at two other pulse durations using the same subjects, at all five pulse durations in a set of new subjects, and at one pulse duration but different applied loads in ten subjects from a previous study. More than 65% of the variability in the measurements was explained by the new force-fatigue model.

Original languageEnglish (US)
Title of host publicationASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
Pages641-650
Number of pages10
Volume2
DOIs
StatePublished - 2010
EventASME 2010 International Mechanical Engineering Congress and Exposition, IMECE 2010 - Vancouver, BC, Canada
Duration: Nov 12 2010Nov 18 2010

Other

OtherASME 2010 International Mechanical Engineering Congress and Exposition, IMECE 2010
CountryCanada
CityVancouver, BC
Period11/12/1011/18/10

Keywords

  • Functional electrical stimulation (FES)
  • Mathematical model
  • Muscle fatigue
  • Non-isometric
  • Pulse duration

ASJC Scopus subject areas

  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Predicting the effect of pulse duration on fatigue during electrical stimulation'. Together they form a unique fingerprint.

  • Cite this

    Marion, M. S., Hull, M. L., & Wexler, A. S. (2010). Predicting the effect of pulse duration on fatigue during electrical stimulation. In ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) (Vol. 2, pp. 641-650) https://doi.org/10.1115/IMECE2010-40865