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Related Experiment Videos

Incomplete muscle activation after training with electromyostimulation

T Hortobágyi1, J Lambert, K Scott

  • 1Biomechanics Laboratory, East Carolina University, Greenville, NC 27858, USA.

Canadian Journal of Applied Physiology = Revue Canadienne De Physiologie Appliquee
|June 6, 1998
PubMed
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Electromyostimulation (EMS) training improved EMS-evoked strength more than voluntary training improved voluntary strength. However, EMS training may lead to incomplete muscle activation, as indicated by increased EMS-evoked to voluntary force ratios.

Area of Science:

  • Exercise Physiology
  • Neuromuscular Adaptation

Background:

  • Eccentric muscle contractions and electromyostimulation (EMS) preferentially recruit large motor units.
  • Complete muscle activation is expected during voluntary or EMS-evoked eccentric contractions.

Purpose of the Study:

  • To compare the effects of voluntary (VOL) versus EMS-evoked eccentric training on muscle strength and activation.
  • To investigate whether EMS training ensures complete muscle activation.

Main Methods:

  • 22 women (ages 18-40) were assigned to VOL, EMS, or control groups.
  • VOL and EMS groups underwent 6 weeks of quadriceps training (4x/week) at increasing force levels.
  • Training involved either voluntary or EMS-evoked eccentric contractions.

Main Results:

Related Experiment Videos

  • Both VOL and EMS training improved eccentric strength.
  • EMS training resulted in greater improvements in EMS-evoked strength compared to VOL training's effect on voluntary strength.
  • The ratio of EMS-evoked to voluntary force increased significantly in the EMS group post-training (0.57 to 1.20).

Conclusions:

  • EMS training enhances eccentric strength, potentially more effectively than voluntary training for specific contraction types.
  • Increased EMS-evoked to voluntary force ratio suggests incomplete muscle activation after EMS training in some individuals.
  • Further research is needed to optimize EMS protocols for complete muscle recruitment.