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Decrease in elbow flexor inhibition after cervical spine manipulation in patients with chronic neck pain.

Esther Suter1, Gordon McMorland

  • 1Faculty of Kinesiology, The University of Calgary, 2500 University Drive NW, Calgary AB, Canada T2N 1N4. esthersuter@integrativehealth.ca

Clinical Biomechanics (Bristol, Avon)
|September 11, 2002
PubMed
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Chronic neck pain patients exhibit biceps muscle inhibition. Cervical spine manipulation effectively reduced this inhibition, improved elbow flexor strength, and enhanced range of motion and pain sensitivity.

Area of Science:

  • Neuromuscular function
  • Musculoskeletal rehabilitation
  • Pain management

Background:

  • Muscle inhibition, characterized by an inability to fully activate a muscle, is a known consequence of joint pathologies and low back pain.
  • While chronic neck pain is linked to altered muscle recruitment and coordination in the upper extremities, muscle inhibition has not been previously investigated in this condition.

Purpose of the Study:

  • To assess functional capacity and subjective pain in chronic neck pain patients.
  • To investigate biceps muscle inhibition in individuals with chronic neck pain.
  • To evaluate the effects of cervical spine manipulation on muscle function, pain, and range of motion.

Main Methods:

  • The study involved 16 patients diagnosed with chronic neck pain.

Related Experiment Videos

  • Biceps muscle activation was measured using the interpolated twitch technique and electromyography during maximal voluntary elbow flexor contractions.
  • Cervical range of motion and pressure pain thresholds were assessed, followed by cervical spine manipulation at C5/6/7 and repeat functional measurements.

    • Main Results:

    • Patients demonstrated significant biceps muscle inhibition, restricted lateral cervical range of motion, and heightened pressure pain sensitivity.
    • Following cervical spine manipulation, a notable decrease in biceps inhibition and an increase in elbow flexor force were observed.
    • Significant improvements were recorded in cervical range of motion and pressure pain thresholds post-manipulation.

    Conclusions:

    • Biceps muscle dysfunction, characterized by an inability to achieve full activation, is evident in chronic neck pain patients.
    • Cervical spine manipulation demonstrated a short-term efficacy in reducing muscle inhibition and enhancing elbow flexor strength.
    • The findings suggest that spinal manipulation may be a beneficial therapeutic approach for managing chronic neck pain by improving muscle function, range of motion, and pain sensitivity.