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Repetitive Grasping After Stroke Assisted by Functional Electrical Stimulation.

Chiara Höhler1,2, Satoshi Endo3, Joachim Hermsdörfer2

  • 1Department of Neurology-Research Group, Schoen Clinic Bad Aibling, Bad Aibling, Germany.

Artificial Organs
|June 27, 2025
PubMed
Summary
This summary is machine-generated.

Functional Electrical Stimulation (FES) effectively assists stroke patients in grasping and releasing objects, enabling sufficient grip force without significant muscle fatigue. This technology shows promise for improving daily living activities for individuals with hemiparesis.

Keywords:
Functional Electrical Stimulationactivities of daily livingassistive devicesgrip forcestroke

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Area of Science:

  • Rehabilitation Engineering
  • Neuroscience
  • Biomechanics

Background:

  • Investigated grip force requirements for object grasping and release using Functional Electrical Stimulation (FES) in hemiparetic patients.
  • Assessed FES utility in assisting essential motion primitives: sufficient force production, sustained grip, successful release, and fatigue monitoring.

Purpose of the Study:

  • To evaluate the efficacy of Functional Electrical Stimulation (FES) in augmenting grip force for hemiparetic patients post-stroke.
  • To determine if FES-assisted grasping meets the requirements for daily living activities, including force generation, maintenance, release, and muscle fatigue.

Main Methods:

  • Observational, cross-sectional study involving hemiparetic patients repetitively grasping and releasing a sensorized object with FES assistance.
  • Measured grip force metrics including maximum grip force (GFmax), duration of force maintenance, and release ratio, analyzing changes across repetitions for fatigue.

Main Results:

  • Patients achieved a median GFmax of 6.9 N, with force levels comparable to healthy individuals and sufficient for object transportation.
  • Grip force was maintained for a median of 1.8 seconds, and assisted release was significantly better in patients with spasticity.
  • No physiologically meaningful muscle fatigue was observed during repetitive FES-assisted grasping tasks.

Conclusions:

  • FES assistance enables stroke patients to produce adequate grip force for object manipulation without significant fatigue.
  • The grip forces achieved are relevant for activities of daily living, highlighting FES's assistive potential.
  • Further validation is needed for FES effectiveness in grasping real-world objects.