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Related Experiment Videos

Tonic vibration reflexes and background force level.

J R Lackner1, P DiZio, J Fisk

  • 1Ashton Graybiel Spatial Orientation Laboratory, Brandeis University, Waltham, MA 02254-9110.

Acta Astronautica
|January 1, 1992
PubMed
Summary
This summary is machine-generated.

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The functional stretch reflex, crucial for posture, adjusts immediately to changing gravity levels during parabolic flights. This reflex, measured by the tonic vibration reflex, shows rapid adaptation to altered gravitoinertial forces.

Area of Science:

  • Neuroscience
  • Human Physiology
  • Space Biology

Background:

  • The functional stretch reflex is vital for maintaining posture and muscle tone on Earth.
  • Understanding reflex adaptation is key to human adaptation to different gravitational environments.

Purpose of the Study:

  • To investigate if the functional stretch reflex, specifically the tonic vibration reflex, adapts to altered gravitoinertial force levels.
  • To evaluate the speed and direction of this adaptation during parabolic flight.

Main Methods:

  • Experiments were conducted during parabolic flights to simulate varying gravitoinertial forces.
  • The tonic vibration reflex was used as a measure of the functional stretch reflex.
  • Measurements were taken to assess reflex responses under different force conditions.
Keywords:
NASA Discipline NeuroscienceNASA Discipline Number 16-10NASA Program Space Physiology and CountermeasuresNon-NASA Center

Related Experiment Videos

Main Results:

  • The functional stretch reflex, as indicated by the tonic vibration reflex, demonstrated virtually immediate adjustments.
  • These alterations were of the appropriate sign, meaning the reflex adapted correctly to the changing force levels.
  • The reflex showed significant plasticity in response to acute changes in the gravitational environment.

Conclusions:

  • The human functional stretch reflex rapidly and appropriately adjusts to acute changes in gravitoinertial force.
  • This rapid adaptation suggests a robust neural mechanism for maintaining motor control across different gravitational conditions.
  • Findings have implications for understanding human motor control in spaceflight and other altered gravity scenarios.