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Head position during various locomotor executions after prolonged microgravity exposure.

Gregoire Courtine1, Thierry Pozzo

  • 1INSERM Motricity & Plasticity, Universite de Bourgogne, France. gregoire.courtine@u-bourgogne.fr

Journal of Gravitational Physiology : a Journal of the International Society for Gravitational Physiology
|March 9, 2004
PubMed
Summary

Astronauts showed head flexion after microgravity, likely to enhance vestibular input for better balance. Recovery was rapid, with normal head positioning and walking abilities returning by six days post-flight.

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Area of Science:

  • Space Medicine
  • Human Physiology
  • Neuroscience

Background:

  • Prolonged microgravity exposure significantly impacts sensorimotor functions, including balance and spatial orientation.
  • Astronauts experience physiological adaptations during spaceflight that require readaptation upon return to Earth's gravity.

Purpose of the Study:

  • To investigate head orientation strategies during locomotion after prolonged microgravity exposure.
  • To assess the time course of sensorimotor readaptation in astronauts post-flight.

Main Methods:

  • Assessed head orientation in the sagittal plane before and on days 2 and 6 after a 6-month microgravity exposure.
  • Instructed 7 astronauts to perform various locomotor tasks: stair ascent, jump down, and level walking.

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Main Results:

  • Astronauts exhibited systematic head flexion during locomotion on day 2 post-flight compared to pre-flight.
  • Normal cephalic orientation was observed by day 6 post-flight.
  • Rapid recovery of normal walking capacities was noted despite prolonged microgravity.

Conclusions:

  • Head flexion post-microgravity may be a compensatory strategy to enhance vestibular sensibility and improve dynamic equilibrium control.
  • Astronauts demonstrate a high rate of sensorimotor re-adaptation, quickly regaining functional locomotion after extended spaceflight.