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Related Concept Videos

Motor Unit Stimulation01:20

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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
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Oxygen Consumption While Walking With Multijoint Neuromuscular Electrical Stimulation After Stroke.

Nathaniel S Makowski1, Rudi Kobetic, Kevin M Foglyano

  • 1From the MetroHealth Medical Center, Cleveland, Ohio (NSM); Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, Ohio (NSM, RK, KMF, LML, SMS, GP, RJT); and Case Western Reserve University, Cleveland, Ohio (NSM, SMS, RJT).

American Journal of Physical Medicine & Rehabilitation
|March 10, 2020
PubMed
Summary

Neuromuscular electrical stimulation (NMES) significantly improved walking speed and efficiency in a stroke survivor. This technology offers potential for enhanced community mobility and reduced energy cost during gait for individuals post-stroke.

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Area of Science:

  • Neuroscience
  • Rehabilitation Medicine
  • Biomedical Engineering

Background:

  • Stroke survivors often experience impaired gait, leading to reduced mobility and increased energy expenditure.
  • Assessing the efficacy of assistive technologies like neuromuscular electrical stimulation (NMES) is crucial for improving post-stroke rehabilitation outcomes.

Observation:

  • A single stroke survivor with an asymmetric gait pattern participated in repeated 6-minute walk tests.
  • Gait assistance was provided using implanted multijoint NMES targeting the hip, knee, and ankle.
  • Walking tests were conducted both with and without NMES at self-selected speeds.

Findings:

  • NMES more than doubled walking speed (0.28 to 0.58 m/sec) and increased step length and cadence.
  • The energy cost of walking decreased by 0.19 ml O2/kg per meter with NMES.
  • Oxygen consumption increased, but metabolic demands were comparable to unimpaired walking at similar speeds, indicating improved efficiency.

Implications:

  • Multijoint NMES may enhance gait economy and facilitate community ambulation within metabolic reserves for stroke survivors.
  • Further research is needed to validate these findings in a larger, diverse population of stroke survivors.
  • NMES holds promise as a tool to improve functional mobility and reduce the burden of walking post-stroke.