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Assessing Sensorimotor Function Following ISS with Computerized Dynamic Posturography.

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Summary
This summary is machine-generated.

Postflight postural ataxia, a result of microgravity and deconditioning, was measured using computerized dynamic posturography (CDP). Dynamic head tilts significantly worsened balance and prolonged recovery, highlighting the need for effective countermeasures.

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Area of Science:

  • Space medicine
  • Human physiology
  • Neuroscience

Background:

  • Postflight postural ataxia is a consequence of altered movement control in microgravity and physiological deconditioning.
  • Computerized dynamic posturography (CDP) has been instrumental in assessing postural stability changes in astronauts post-International Space Station (ISS) missions.

Purpose of the Study:

  • To quantify postflight decrements and recovery of postural stability using CDP.
  • To evaluate the impact of different sensory conditions and head movements on balance control.
  • To assess the effectiveness of countermeasures for mitigating spaceflight-induced deconditioning.

Main Methods:

  • CDP data collected from 37 crewmembers during pre- and postflight medical evaluations.
  • Sensory organization tests (SOT) under eyes-closed conditions with fixed or sway-referenced support, and head-erect or pitch-head tilted positions.
  • Motor-control tests to assess recovery from unexpected support surface perturbations.

Main Results:

  • Dynamic head tilts significantly increased falls and recovery time compared to head-erect conditions.
  • Standard Romberg condition showed minimal sensitivity in detecting postural instability.
  • Improvements in later expeditions suggest potential benefits from higher preflight baselines or enhanced ISS exercise.

Conclusions:

  • Postural instability is exacerbated by dynamic head movements on unstable surfaces.
  • CDP serves as a standardized sensorimotor measure for return-to-duty assessments.
  • CDP can evaluate the efficacy of countermeasures for spaceflight-related deconditioning.