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Related Experiment Videos

Changes in head and neck position affect elbow joint position sense.

Joanna J Knox1, Paul W Hodges

  • 1Division of Physiotherapy, The University of Queensland, QLD 4072, Australia. j.knox@uq.edu.au

Experimental Brain Research
|May 4, 2005
PubMed
Summary

Altering head and neck position significantly impacts elbow joint position sense (JPS) accuracy. This suggests head position errors, not just target misperceptions, contribute to upper limb pointing inaccuracies.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Human Movement Science

Background:

  • Head and neck position changes are known to affect upper limb pointing accuracy.
  • Previous research often attributed this to altered perceived target location.
  • The specific impact on limb position perception, particularly joint position sense (JPS), remained unexplored.

Purpose of the Study:

  • To investigate if changes in head and neck position affect elbow joint position sense (JPS) accuracy.
  • To determine if altered JPS contributes to previously observed pointing errors.

Main Methods:

  • Elbow JPS was assessed with the neck in four positions: neutral, flexion, rotation, and combined flexion/rotation.
  • Participants passively reproduced a target elbow angle with the neck in neutral, then actively reproduced it in one of the test neck positions.

Related Experiment Videos

  • A control condition accounted for potential distraction from head movement during neck repositioning.

    • Main Results:

    • Absolute and variable joint position errors (JPE) were significantly greater when reproducing the target angle with the neck in flexion, rotation, or combined positions compared to neutral.
    • This indicates reduced accuracy in sensing elbow joint angle with altered head and neck postures.

    Conclusions:

    • Changes in head and neck position directly impair elbow joint position sense (JPS).
    • This impairment in JPS likely contributes to the reduced accuracy observed in upper limb pointing tasks when head position varies.
    • Findings suggest errors in interpreting arm position are a key factor, not solely target misperception.