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Related Experiment Videos

Variable-frequency trains offset low-frequency fatigue in human skeletal muscle.

D W Russ1, S A Binder-Macleod

  • 1Department of Physical Therapy, University of Delaware, 315 McKinly Laboratory, Newark, Delaware 19716, USA.

Muscle & Nerve
|July 9, 1999
PubMed
Summary

Variable-frequency trains enhance muscle force during fatigue and recovery. This method may help offset long-term effects of low-frequency fatigue (LFF) in skeletal muscle.

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Area of Science:

  • Exercise Physiology
  • Muscle Physiology
  • Neuromuscular Function

Background:

  • Skeletal muscle force can be augmented by specific electrical stimulation frequencies.
  • Variable-frequency trains (VFTs) exploit the catchlike property of muscle.
  • The effects of VFTs during muscle recovery from fatigue are not well understood.

Purpose of the Study:

  • To investigate the efficacy of VFTs in augmenting force production during recovery from electrically induced fatigue.
  • To compare the force augmentation from VFTs against constant-frequency trains (CFTs).
  • To explore the relationship between VFT force augmentation and low-frequency fatigue (LFF).

Main Methods:

  • Healthy individuals' quadriceps femoris muscles were fatigued using a 14.3-Hz VFT protocol.

Related Experiment Videos

  • Muscle force was assessed using various CFTs (8.3-100 Hz) and a VFT.
  • Assessments were conducted before fatigue and at intervals during 38 minutes of recovery.

    • Main Results:

    • VFTs significantly augmented force compared to the best CFT (12.5 Hz) during acute fatigue and recovery.
    • The fatiguing protocol induced LFF.
    • The degree of LFF was inversely related to VFT force augmentation, suggesting a shared mechanism.

    Conclusions:

    • VFTs are effective in enhancing skeletal muscle force during both acute fatigue and the subsequent recovery period.
    • The findings suggest VFTs could be clinically useful, for example, in functional electrical stimulation (FES).
    • VFTs may help mitigate the long-term impacts of LFF.