Comparison of cervical musculoskeletal kinematics in two different postures of primate during voluntary head tracking

Hyeonki Choi*, Emily Keshner, Barry W. Peterson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We have examined the effect on neck-muscle activation of altering whole body posture. A Rhesus monkey (Macaco mulatta) was trained to produce sinusoidal (0.25 Hz) head tracking movements in the sagittal plane when seated with trunk and head vertical or while standing in the quadrupedal position. Video-fluoroscopic images of cervical vertebral motion, and electromyographic (EMG) responses were recorded simultaneously. Results demonstrated that vertebral motion varied with body posture, occurring synchronously between all joints in the upright position and primarily at skull-C1 when in the quadrupedal position. Muscle EMG activation was significantly greater (p<0.001) in the quadrupedal position than when upright for all muscles except semispinalis cervicis. Peak activation of all the muscles occurred prior to peak head extension in the quadrupedal position, suggesting synchronous activity between muscles. Data suggest that, when upright, muscles were activated in functional groupings defined by their anatomical arrangement. In the quadrupedal position, gravity acting on the horizontally oriented head produced greater activation and a collective response of the muscles.

Original languageEnglish (US)
Pages (from-to)1140-1147
Number of pages8
JournalKSME International Journal
Volume17
Issue number8
DOIs
StatePublished - Jan 1 2003

Keywords

  • Cervical Kinematics
  • Different Postures
  • EMG
  • Neck Musculature
  • Primate
  • Video-fluoroscopy

ASJC Scopus subject areas

  • Mechanical Engineering

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