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Related Experiment Videos

Cristospinal reflex in circular walking.

S Ito1, S Odahara, M Hirano

  • 1Department of Otolaryngology, Kurume University Hospital, Japan.

Acta Oto-Laryngologica
|January 1, 1992
PubMed
Summary

Circular walking affects leg muscle activity via the semicircular canal. Caloric stimulation alters this response, influencing antigravity muscle tonus and body weight support during gait.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Human Physiology

Background:

  • The semicircular canal plays a role in balance and spatial orientation.
  • Gait involves complex coordination of antigravity muscles.
  • Understanding the vestibulo-muscular response is crucial for analyzing locomotion.

Purpose of the Study:

  • To investigate the influence of caloric stimulation of the semicircular canal on gastrocnemius muscle activity during circular walking.
  • To determine how ampullopetal lymphatic flow affects antigravity muscle tonus and body support during gait.

Main Methods:

  • Electromyograms (EMGs) of the bilateral gastrocnemius muscles were recorded in 22 healthy adults.
  • Participants performed circular walking under two conditions: baseline and after caloric stimulation of the right auditory canal.
  • The horizontal semicircular canal was positioned vertically during stimulation.

Main Results:

  • Without stimulation, right gastrocnemius activity was higher during dextrorotation, and left higher during sinistrorotation.
  • After right ear irrigation, left gastrocnemius activity exceeded right during sinistrorotation; no difference was seen during dextrorotation.
  • Dextrorotation was consistently associated with ataxic gait.

Conclusions:

  • Ampullopetal lymphatic flow in the semicircular canal during circular walking increases ipsilateral antigravity muscle tonus.
  • This response aids in supporting body weight as it shifts inward during circular locomotion.
  • Caloric stimulation disrupts the typical vestibulo-muscular response during specific rotational movements.

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