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Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
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Shoulder Joint Position Sense Can Be Reduced by Sensory Reference Frame Transformations.

David Phillips1, Albena Zahariev2, Andrew Karduna2

  • 1Department of Exercise Science and Physical Education, Montclair State University, Montclair, New Jersey, United States.

Perceptual and Motor Skills
|February 17, 2021
PubMed
Summary

Vision significantly impacts joint position sense (JPS) accuracy. Occluding vision during memorization (P-VP) reduced accuracy, while occlusion during replication (VP-P) did not, suggesting visual-proprioceptive transformation challenges.

Keywords:
body schemajoint position senseproprioceptionshouldervision

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Area of Science:

  • Neuroscience
  • Kinesiology
  • Human Movement Science

Background:

  • Joint position sense (JPS) is crucial for limb control and typically assessed with vision occluded.
  • Accurate limb movement integrates multiple sensory inputs, including vision and proprioception.
  • Understanding vision's role in JPS is vital for rehabilitation and performance enhancement.

Purpose of the Study:

  • To investigate the impact of varying visual availability on shoulder JPS accuracy.
  • To compare JPS performance across four vision conditions: continuous occlusion (P-P), continuous vision (VP-VP), occlusion during memorization (P-VP), and occlusion during replication (VP-P).
  • To examine the influence of target shoulder elevation angles (50°, 70°, 90°) on JPS.

Main Methods:

  • Eighteen healthy participants performed an active JPS angle replication task.
  • Repeated measures ANOVAs analyzed absolute error (AE) and constant error (CE) across vision conditions and target angles.
  • Four vision conditions were tested: P-P, VP-VP, P-VP, and VP-P.

Main Results:

  • A significant main effect of vision condition and target angle was found for both AE and CE (p < 0.01).
  • Highest accuracy was observed in the VP-VP condition; lowest accuracy occurred in the P-VP condition.
  • Accuracy improved with increasing target elevation angles, and participants tended to overestimate the target angle (overshoot).

Conclusions:

  • Vision availability significantly influences shoulder JPS accuracy, with continuous vision yielding the best performance.
  • Occluding vision during target memorization impairs JPS more than during replication.
  • This suggests potential accuracy costs associated with transforming proprioceptive information into a visual reference frame.