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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.
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In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
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SenseJoy, a pluggable solution for assessing user behavior during powered wheelchair driving tasks.

Olivier Rabreau1, Sylvain Chevallier2, Luc Chassagne2

  • 1LISV laboratory, University of Versailles Saint-Quentin, 10-12 avenue de l'Europe, Vélizy, France. olivier.rabreau@lisv.uvsq.fr.

Journal of Neuroengineering and Rehabilitation
|November 8, 2019
PubMed
Summary
This summary is machine-generated.

SenseJoy is a new, easy-to-install system that objectively measures Electric Powered Wheelchair (EPW) joystick use, aiding therapists in driver assessments and recommendations.

Keywords:
Clustering methodData loggerJoystick drivingPerformance assessmentPowered wheelchair prescription

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Area of Science:

  • Biomedical Engineering
  • Rehabilitation Technology
  • Human-Computer Interaction

Background:

  • Electric Powered Wheelchair (EPW) prescription often relies on subjective therapist experience.
  • Direct joystick monitoring, crucial for assessing driver behavior, requires complex disassembly.
  • A need exists for non-invasive, objective methods to analyze EPW control inputs.

Purpose of the Study:

  • To introduce and validate SenseJoy, a novel pluggable system for EPW joystick data acquisition.
  • To assess the accuracy of SenseJoy in estimating joystick commands and inclination angles.
  • To determine SenseJoy's capability in characterizing distinct EPW driver profiles.

Main Methods:

  • SenseJoy, incorporating accelerometers and a gyroscope, was attached to EPW joysticks.
  • Data was collected from 13 drivers with varying conditions in lab and rehabilitation settings.
  • Unsupervised statistical analysis was employed to cluster driver profiles based on collected data.

Main Results:

  • SenseJoy accurately estimated EPW joystick inclination angles with high resolution.
  • Statistical validation confirmed SenseJoy's measurements are equivalent to direct joystick outputs.
  • Unsupervised analysis successfully identified and characterized different driver profiles.

Conclusions:

  • SenseJoy provides a pluggable, non-invasive solution for objective EPW joystick control assessment.
  • The system accurately estimates performance indicators and characterizes driver behavior.
  • SenseJoy offers an efficient tool to support therapists in EPW prescription and driver management.