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Characterization of normative hand movements during two functional upper limb tasks.

Aïda M Valevicius1, Quinn A Boser1, Ewen B Lavoie2

  • 1Department of Biomedical Engineering, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada.

Plos One
|June 22, 2018
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Summary

Researchers developed two standardized upper limb tasks to measure hand movement. These tasks demonstrated consistent performance in healthy individuals, showing promise for assessing hand function in those with impairments.

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Area of Science:

  • Biomechanics
  • Neuroscience
  • Rehabilitation Science

Background:

  • Dexterous hand function is essential for daily activities, requiring precise hand-object interactions.
  • Kinematic analysis offers insights into hand function but lacks standardized ADL-representative tasks for motion capture.
  • Developing such tasks is crucial for consistent performance measurement in non-disabled individuals.

Purpose of the Study:

  • To develop two standardized functional upper limb tasks for assessing hand movement.
  • To quantitatively characterize the kinematics of normative hand movement during these tasks.
  • To establish reliable outcome measures for upper limb impairment assessments.

Main Methods:

  • Twenty non-disabled participants performed the Pasta Box Task and Cup Transfer Task.
  • A 12-camera motion capture system recorded kinematic data for hand movement and grip aperture.
  • Key measures included hand distance, trajectory variability, movement time, peak velocity, and grip aperture.

Main Results:

  • Movement times were longer for transport-release than reach-grasp segments.
  • Most hand and grip aperture measures exhibited low variability and good repeatability (ICC > 0.75).
  • Specific task variations (e.g., cross-body movements, obstacle clearing) influenced kinematic parameters like movement time and velocity profiles.

Conclusions:

  • Standardized functional tasks provide repeatable normative hand kinematic data.
  • These tasks effectively challenge hand-object interactions relevant to activities of daily living (ADLs).
  • The established consistency shows potential as an outcome assessment for individuals with upper limb impairments.