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Spatially distributed sequential stimulation to reduce fatigue of electrically stimulated muscles

Author(s):

R. Nguyen, K. Masani, J. Juandi, S. Micera, M. Morari, M.R. Popovic
Conference/Journal:

International Functional Electrical Stimulation Society Conference, Seoul, Korea
Abstract:

A major limitation of functional electrical stimulation (FES) is the rapid onset of muscle fatigue. The purpose of this study was to investigate the feasibility of reducing fatigue by distributing stimulation over a wide area of muscle using multiple surface electrodes. The triceps surae muscles of an individual with a complete spinal cord injury were electrically stimulated through four active surface electrodes using spatially distributed sequential stimulation (SDSS) that was delivered by sending a stimulation pulse to each electrode one after another. For comparison, single electrode stimulation (SES) was delivered through one active surface electrode. The resultant frequency was 40 Hz for both types of stimulation. Isometric ankle torque was measured during fatiguing stimulations lasting two minutes. Each mode of stimulation was repeated six times and each trial conducted on a different day in random order. Three fatigue measures were used for comparison: fatigue index (final torque normalized to maximum torque), fatigue time (time for torque to drop by 3 dB), and torque-time integral. The measures were all higher during SDSS (paired t-test, P<0.001). We conclude that the use of spatially distributed sequential stimulation is an effective means of reducing muscle fatigue. The technique could, for example, be used to prolong sessions of FES.

Year:

2009
Type of Publication:

(01)Article
Supervisor:



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% Autogenerated BibTeX entry
@InProceedings { NguEtal:2009:IFA_3393,
    author={R. Nguyen and K. Masani and J. Juandi and S. Micera and M. Morari and M.R.
	  Popovic},
    title={{Spatially distributed sequential stimulation to reduce
	  fatigue of electrically stimulated muscles}},
    booktitle={International Functional Electrical Stimulation Society
	  Conference},
    pages={},
    year={2009},
    address={Seoul, Korea},
    month=sep,
    url={http://control.ee.ethz.ch/index.cgi?page=publications;action=details;id=3393}
}
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