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Related Experiment Video

Updated: Jun 27, 2026

Randomized, Triple-Blind, and Parallel-Controlled Trial of Transcranial Direct Current Stimulation for Cognitive Rehabilitation after Stroke
08:53

Randomized, Triple-Blind, and Parallel-Controlled Trial of Transcranial Direct Current Stimulation for Cognitive Rehabilitation after Stroke

Published on: June 6, 2025

Variable stimulation patterns for poststroke hemiplegia.

Barbara M Doucet1, Lisa Griffin

  • 1Department of Occupational Therapy, University of Texas Medical Branch at Galveston, Galveston, Texas, USA.

Muscle & Nerve
|December 18, 2008
PubMed
Summary
This summary is machine-generated.

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Neuromuscular electrical stimulation can be limited by muscle fatigue. A study found that using doublet stimulation patterns, especially later in a session, can improve force output in older adults and stroke survivors.

Area of Science:

  • Neurology
  • Rehabilitation Medicine
  • Biomedical Engineering

Background:

  • Neuromuscular electrical stimulation (NMES) enhances motor function in paralysis but is hindered by muscular fatigue.
  • Limited research exists on variable NMES patterns in older adults or stroke survivors, despite age-related neuromuscular changes.

Purpose of the Study:

  • To investigate the effects of different intermittent NMES patterns on force production in older adults with and without stroke-induced hemiplegia.
  • To determine if variable stimulation patterns, including doublet pulses, can mitigate fatigue and improve outcomes.

Main Methods:

  • Ten individuals with hemiplegia post-stroke and ten age-matched able-bodied adults participated.
  • Three 3-minute intermittent stimulation patterns were applied to the median nerve: constant 20 Hz, 20-40 Hz ramp, and a 20 Hz pattern switching to 20 Hz doublets.

Related Experiment Videos

Last Updated: Jun 27, 2026

Randomized, Triple-Blind, and Parallel-Controlled Trial of Transcranial Direct Current Stimulation for Cognitive Rehabilitation after Stroke
08:53

Randomized, Triple-Blind, and Parallel-Controlled Trial of Transcranial Direct Current Stimulation for Cognitive Rehabilitation after Stroke

Published on: June 6, 2025

Main Results:

  • In able-bodied adults, the doublet pattern yielded significantly higher force-time integrals (FTI) than the other patterns.
  • Post-stroke individuals also showed the highest FTI with the doublet pattern, outperforming the other patterns.

Conclusions:

  • Stimulation protocols incorporating doublets in later fatigue stages are effective for older adults, including those with stroke-related paralysis.
  • Doublet stimulation may offer a viable strategy to enhance NMES efficacy and combat fatigue in specific populations.