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Related Experiment Videos

Muscle enhancement using closed-loop electrical stimulation: volitional versus induced torque.

E Langzam1, Y Nemirovsky, E Isakov

  • 1Department of Biomedical Engineering, Technion, Israel Institute of Technology, Haifa 32000, Israel.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|May 13, 2006
PubMed
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This study introduces a computational method to separate muscle force contributions during hybrid activation, combining electrical stimulation (ES) and voluntary effort. The findings reveal how stimulation enhances muscle capacity, particularly in combined activation scenarios.

Area of Science:

  • Biomechanics
  • Neuroscience
  • Sports Science

Background:

  • Partial muscle activation capacity deficits can be overcome using hybrid activation, combining electrical stimulation (ES) with volitional effort.
  • The precise contributions of volitional and ES-induced torques in hybrid activation remain unclear.

Purpose of the Study:

  • To develop and validate a computational approach for quantifying volitional and ES-induced torque components during Tibialis Anterior (TA) muscle activation.
  • To analyze the interplay between volitional and ES contributions to overall joint torque.

Main Methods:

  • Isometric contractions of the TA muscle were performed by 5 healthy subjects under ES alone, volitional activation alone, and hybrid activation conditions.
  • Ankle torque and TA electromyography (EMG) were recorded.

Related Experiment Videos

  • A computational algorithm, utilizing EMG filtering and volitional torque-EMG calibration curves, was developed to dissociate torque components.

    • Main Results:

    • A linear inverse relationship was observed between the shares of induced torque and volitional torque for a given hybrid torque.
    • An enhancement ratio analysis indicated specific stimulation intensity ranges where combined activation yielded greater efficiency than isolated activation.
    • The study identified regions of increased facilitation under hybrid activation.

    Conclusions:

    • The developed computational method effectively distinguishes volitional and ES-induced torque contributions during hybrid muscle activation.
    • Hybrid activation can lead to enhanced muscle force production and stimulation efficiency compared to isolated activation methods.
    • Understanding these contributions is crucial for optimizing rehabilitation and training strategies involving neuromuscular electrical stimulation.