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Related Concept Videos

Motor Unit Stimulation01:20

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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
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Encouraging Volitional Pedaling in Functional Electrical Stimulation-Assisted Cycling Using Barrier Functions.

Axton Isaly1, Brendon C Allen1, Ricardo G Sanfelice2

  • 1Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, United States.

Frontiers in Robotics and AI
|December 13, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a novel control system for stationary cycling that combines motor and functional electrical stimulation (FES) to help individuals with movement impairments maximize their effort safely and effectively during therapy.

Keywords:
) cyclingbarrier functioncontrol designeuler-Lagrangefunctional electrical stimulation (FESsafety-critical

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Area of Science:

  • Rehabilitation Engineering
  • Control Systems Theory
  • Biomechanics

Background:

  • Stationary cycling with functional electrical stimulation (FES) is a key therapy for movement impairments.
  • Maximizing rider's volitional effort enhances long-term benefits like strength and endurance.
  • Existing systems may not adequately balance safety, rider effort, and therapeutic assistance.

Purpose of the Study:

  • To develop and validate a combined motor and FES control system for stationary cycling.
  • To maximize rider's volitional contribution while ensuring safety within a defined cadence range.
  • To investigate the use of barrier functions and robust control for guaranteed safety and stability.

Main Methods:

  • A combined motor and FES control system was developed using safety-ensuring barrier functions.
  • Robust control tools from Lyapunov theory were integrated to handle uncertain dynamics.
  • The closed-loop system was modeled as a hybrid system to ensure asymptotic stability.
  • Experimental validation was performed on five participants.

Main Results:

  • The barrier function controller successfully constrained rider cadence within a 50 ± 5 RPM range.
  • Minimal motor assistance (4.1% of trial duration) was required when prioritizing cadence stability.
  • The system demonstrated effective control, prioritizing rider power output in a separate protocol.

Conclusions:

  • The developed control system effectively maximizes rider effort in FES-assisted cycling while guaranteeing safety.
  • Barrier function and robust control methods provide a reliable framework for therapeutic cycling systems.
  • This approach holds promise for enhancing rehabilitation outcomes for individuals with movement impairments.