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Noninvasive analysis of human neck muscle function

M S Conley1, R A Meyer, J J Bloomberg

  • 1Department of Exercise Science, University of Georgia, Athens, USA.

Spine
|December 1, 1995
PubMed
Summary
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This study used magnetic resonance imaging (MRI) to reveal how different head movements activate neck muscles. Findings show increased muscle use with higher exercise intensity, aiding in understanding cervical musculoskeletal disorders.

Area of Science:

  • Biomechanics of human movement
  • Musculoskeletal imaging techniques
  • Cervical spine anatomy and function

Background:

  • Exercise-induced changes in T2-weighted magnetic resonance imaging (MRI) signal relaxation times indicate muscle activity.
  • Noninvasive MRI is suitable for investigating the neck's neuromuscular system.

Purpose of the Study:

  • To examine the intensity and pattern of neck muscle activation during various head movements.
  • To provide insights into the pathophysiology of cervical musculoskeletal disorders and inform treatment strategies.

Main Methods:

  • Quantified T2-weighted MRI signal relaxation time shifts at rest and after moderate/intense exercise for four head movements (extension, flexion, rotation, lateral flexion).
  • Assessed the extent of T2 increase and the cross-sectional area of muscle showing signal shifts to determine muscle use intensity and pattern in nine neck muscles/pairs across seven subjects.
Keywords:
NASA Center JSCNASA Discipline MusculoskeletalNASA Discipline Number 26-10NASA Program Space Physiology and Countermeasures

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Main Results:

  • Muscle activation intensity, indicated by signal relaxation increase, correlated positively with exercise intensity for all head movements.
  • The proportion of muscle area affected by signal shifts also increased with exercise load.
  • Specific neck muscles were identified as primary movers for each head movement: extension (semispinalis capitis/cervicis, splenius capitis), flexion (sternocleidomastoid, longus capitis/colli), rotation (splenius capitis, levator scapulae, scalenus, ipsilateral semispinalis capitis, contralateral sternocleidomastoid), and lateral flexion (sternocleidomastoid).

Conclusions:

  • The study's findings largely align with established anatomical functions of neck muscles and limited prior electromyographic data.
  • Exercise-induced MRI signal shifts offer a detailed method for studying neck muscle function and morphology.