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Related Experiment Videos

Neck muscle activation patterns in humans during isometric head stabilization.

E A Keshner1, D Campbell, R T Katz

  • 1Sensory-Motor Performance Program, Rehabilitation Institute of Chicago, Northwestern University Medical School, IL 60611.

Experimental Brain Research
|January 1, 1989
PubMed
Summary

The central nervous system programs neck muscles for specific activation directions, not infinite patterns. This study reveals preferred muscle activation orientations during head movements.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Kinesiology

Background:

  • The head-neck motor system has numerous muscles, allowing for varied movement patterns.
  • Understanding muscle activation is key to comprehending motor control and biomechanics.

Purpose of the Study:

  • To investigate the preferred activation directions of neck muscles during head stabilization.
  • To determine if muscle responses are specific or varied.

Main Methods:

  • Recorded electromyography (EMG) from four neck muscles in 15 subjects during isometric head stabilization.
  • Analyzed muscle response patterns using surface and intramuscular electrodes.

Main Results:

  • Each tested neck muscle exhibited a preferred direction of activation.

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  • Three muscles showed consistent preferred directions across subjects; the splenius muscle varied.
  • Muscle activation showed a linear relationship with force in preferred directions and nonlinear in nonpreferred directions.

    • Conclusions:

    • The central nervous system (CNS) programs neck muscles for specific directional responses, aligning with findings in feline models.
    • This specificity has implications for understanding reciprocal activation and cocontraction patterns.