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Related Experiment Video

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Neck muscle fatigue alters upper limb proprioception.

Mahboobeh Zabihhosseinian1, Michael W R Holmes, Bernadette Murphy

  • 1Faculty of Health Sciences, University of Ontario Institute of Technology, 2000 Simcoe St. North, Oshawa, ON, L1H 7K4, Canada.

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Fatiguing neck muscles impairs upper limb proprioception, reducing the accuracy of elbow joint position awareness. This suggests neck afferent input is crucial for limb position sense.

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Area of Science:

  • Neuroscience
  • Kinesiology
  • Human Movement Science

Background:

  • Proprioception, or limb position awareness, is vital for motor control and posture.
  • The central nervous system integrates neck and head position to interpret upper limb location.
  • Altered sensory input from neck muscles may negatively impact upper limb proprioception.

Purpose of the Study:

  • To investigate if cervical extensor muscle (CEM) fatigue affects the ability to reproduce an elbow angle.
  • To determine if neck muscle fatigue influences upper limb joint position awareness.

Main Methods:

  • Twelve healthy participants underwent a submaximal isometric neck extension fatigue protocol (70% maximum voluntary contraction).
  • Cervical extensor muscle activity was monitored using surface electromyography.
  • Elbow joint kinematics were measured to assess joint position reproduction accuracy before and after fatigue.

Main Results:

  • Joint position error significantly increased after CEM fatigue (p ≤ 0.0001).
  • Fatigue of the cervical extensors led to reduced accuracy in recreating a specific elbow angle.
  • No significant changes were observed in variable or constant error, indicating a specific deficit in absolute accuracy.

Conclusions:

  • Fatigue of the cervical extensor muscles demonstrably impairs upper limb proprioception.
  • Altered afferent feedback from the neck following muscle fatigue may be responsible for reduced joint position sense.
  • These findings highlight the interconnectedness of neck afferent input and upper limb proprioceptive acuity.