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Related Experiment Videos

Movement detection at the human big toe

K M Refshauge1, J L Taylor, D I McCloskey

  • 1Prince of Wales Medical Research Institute, High Street, Randwick, Sydney, NSW 2031, Australia.

The Journal of Physiology
|October 23, 1998
PubMed
Summary
This summary is machine-generated.

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Ankle position significantly impacts big toe proprioception. Plantarflexion improves toe joint position sense by enhancing muscle-tendon coupling, suggesting nervous system focus on muscle fascicle length changes.

Area of Science:

  • Biomechanics
  • Neuroscience
  • Human Movement Science

Background:

  • Proprioceptive acuity at the big toe is lower than at other joints.
  • This reduced acuity may stem from poor coupling between the toe and its operating muscles due to foot and ankle anatomy.

Purpose of the Study:

  • To investigate the effect of ankle position on proprioceptive acuity at the big toe.
  • To understand how ankle joint mechanics influence the transfer of toe movement to muscle activity.

Main Methods:

  • Proprioceptive acuity at the toe was measured with the ankle in various positions.
  • Muscle fascicle length changes in the extensor hallucis longus were measured during surgical exposure in one subject, correlating toe movement with ankle position.

Main Results:

Related Experiment Videos

  • Ankle plantarflexion was found to improve proprioceptive acuity at the big toe.
  • Ankle position dramatically affected movement transfer from the toe to the extensor hallucis longus tendon; no movement transferred with the ankle dorsiflexed, while all movement transferred with plantarflexion.

Conclusions:

  • The findings suggest that ankle position is crucial for effective proprioception at the big toe.
  • Improved acuity in plantarflexion indicates better toe-to-muscle coupling, implying the nervous system prioritizes muscle fascicle length changes for joint position sense.