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Posture Estimation Using Surface Electromyography during Wheelchair Hand-Rim Operations.

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This study introduces a dual hand-rim wheelchair for one-arm propulsion, finding it generates equal force to two-arm propulsion. It also reveals specific muscle activation and posture changes for effective one-arm wheelchair use.

Keywords:
assistive technologycompetitive wheelchairiEMGmuscle activationparasportssEMGseat pressure

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Area of Science:

  • Biomechanics
  • Rehabilitation Engineering
  • Sports Science

Background:

  • Competitive wheelchair sports require efficient propulsion systems.
  • Existing designs may not optimize single-arm use for athletes.
  • Understanding biomechanics of one-arm propulsion is crucial for performance and injury prevention.

Purpose of the Study:

  • To evaluate a novel dual hand-rim system for competitive wheelchairs enabling one-arm propulsion.
  • To analyze muscle activation patterns and body posture during one-arm wheelchair propulsion using integrated electromyography (iEMG).
  • To compare the propulsive force and biomechanical demands of one-arm versus two-arm propulsion.

Main Methods:

  • Development of a competitive wheelchair with a dual hand-rim system for simultaneous, single-side operation.
  • Utilizing surface electromyography (sEMG) to calculate integrated electromyography (iEMG) for muscle activation analysis.
  • Conducting experiments to measure muscle activation, estimate body posture, and assess wheelchair loading characteristics during propulsion.

Main Results:

  • One-arm propulsion using the dual hand-rim system can generate propulsive force comparable to two-arm propulsion.
  • The external oblique abdominis muscle plays a significant role in one-arm wheelchair propulsion.
  • iEMG effectively estimated movement posture, validated by body axis shifts and seat pressure distribution.

Conclusions:

  • The dual hand-rim system facilitates effective one-arm propulsion in competitive wheelchairs.
  • One-arm wheelchair propulsion necessitates distinct muscle activation strategies and postural adjustments compared to two-arm propulsion.
  • iEMG is a valuable tool for assessing biomechanics and posture during wheelchair locomotion.