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Mapping of electrical muscle stimulation using MRI

G R Adams1, R T Harris, D Woodard

  • 1Biomedical and Environmental Laboratories, Bionetics Corporation, Kennedy Space Center, Florida.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|February 1, 1993
PubMed
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Electromyostimulation (EMS) and voluntary (VOL) efforts activate muscles differently, with EMS showing dispersed muscle stimulation patterns varying by individual. Torque declined during EMS sets but recovered between them.

Area of Science:

  • Muscle Physiology
  • Neuromuscular Electrostimulation

Background:

  • Understanding muscle activation patterns is crucial for optimizing training and rehabilitation.
  • Electromyostimulation (EMS) offers a method to induce muscle contractions, but its activation patterns compared to voluntary (VOL) efforts require detailed investigation.

Purpose of the Study:

  • To map the muscle contractile activity patterns elicited by EMS.
  • To compare EMS-evoked activity patterns with those of VOL efforts.

Main Methods:

  • Seven subjects performed isometric quadriceps contractions via EMS or VOL efforts at 25%, 50%, and 75% maximal torque.
  • Magnetic resonance (MR) imaging assessed muscle contrast shift (T2 values) to reflect contractile activity.
  • T2 values were analyzed to quantify and visualize muscle activation patterns.
Keywords:
NASA Center KSCNASA Discipline MusculoskeletalNASA Discipline Number 26-10NASA Program Space Physiology and Countermeasures

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Main Results:

  • Torque decreased by ~18% during EMS sets but recovered between sets.
  • EMS increased T2 values across dispersed muscle regions, indicating widespread activation.
  • Muscle stimulation patterns, visualized by T2 changes, exhibited significant inter-individual variability.

Conclusions:

  • EMS and VOL contractions induce distinct muscle activation patterns.
  • The dispersed nature of EMS-induced activation and its inter-individual variability are key findings.
  • MR imaging provides a valuable tool for visualizing and comparing neuromuscular activation strategies.