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Related Experiment Videos

Evaluation of shoulder movement as a command control source.

M W Johnson1, P H Peckham

  • 1Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106.

IEEE Transactions on Bio-Medical Engineering
|September 1, 1990
PubMed
Summary
This summary is machine-generated.

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Scapular shoulder movement shows potential as a command control source for functional neuromuscular stimulation (FNS) hand-grasp systems in individuals with quadriplegia. With signal processing, this method offers an intuitive and learnable control for FNS devices.

Area of Science:

  • Biomedical Engineering
  • Rehabilitation Technology
  • Human-Computer Interaction

Background:

  • Individuals with spinal cord injuries, particularly C5-level quadriplegia, often face significant limitations in motor control.
  • Restoring functional abilities, such as hand grasp, is a primary goal in rehabilitation technology.
  • Existing control systems may have limitations in terms of intuitiveness, learnability, or interference with daily activities.

Purpose of the Study:

  • To evaluate the efficacy of using scapular shoulder movement as a command control source.
  • To assess the processing of shoulder movement signals for integration with a functional neuromuscular stimulation (FNS) hand-grasp system.
  • To compare the performance of C5-level quadriplegic subjects with normal subjects in utilizing shoulder movement for control.

Related Experiment Videos

Main Methods:

  • Externally mounted two-degree-of-freedom transducers were used to measure shoulder movement in three C5-level quadriplegic and nine normal subjects.
  • Subjects performed tasks involving static command level maintenance and dynamic movements along horizontal and vertical axes.
  • Signal processing techniques were applied to analyze movement signals, including rise time and normalized velocity.

Main Results:

  • C5-level quadriplegic subjects exhibited a reduced range of motion and command resolution compared to normal subjects.
  • Quadriplegic subjects showed poorer performance in complex movement tasks and experienced significant signal interference from opposite extremity movements.
  • Rise time and normalized velocity proved effective in distinguishing shoulder movements irrespective of their size.

Conclusions:

  • Scapular shoulder movement, when appropriately processed, is a viable command control source for FNS hand-grasp systems, requiring one proportional and one logical command signal.
  • The transducers are user-friendly, cosmetically acceptable, and do not impede other daily activities like eating or talking.
  • Shoulder movement offers an easily learnable control method with inherent proprioceptive feedback for the user.