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Related Experiment Videos

Gravitoinertial force level influences arm movement control

J Fisk1, J R Lackner, P DiZio

  • 1Ashton Graybiel Spatial Orientation Laboratory, Brandeis University, Waltham, Massachusetts 02254.

Journal of Neurophysiology
|February 1, 1993
PubMed
Summary
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Human arm movements adapt to altered gravity. Rapid movements were unaffected by gravitoinertial force (G) changes, but slow movements revealed G-dependent proprioceptive feedback, impacting accuracy.

Area of Science:

  • Human motor control
  • Neuroscience
  • Biomechanics

Background:

  • The human body adapts to varying gravitoinertial force (G) environments.
  • Understanding sensorimotor adaptation is crucial for spaceflight and terrestrial applications.

Purpose of the Study:

  • To investigate how changes in gravitoinertial force (G) affect human forearm movement control.
  • To determine the role of proprioceptive feedback in adapting to altered G levels.

Main Methods:

  • Subjects performed well-practiced forearm movements in 1G, 1.8G, and 0G environments.
  • Movements were executed in horizontal and vertical planes, at rapid and slow speeds.
  • The arm was unsupported to isolate G-loading effects.

Main Results:

Keywords:
NASA Discipline NeuroscienceNASA Discipline Number 16-10NASA Program Space Physiology and CountermeasuresNon-NASA Center

Related Experiment Videos

  • Movement amplitude for rapid movements remained consistent across G levels.
  • Slow movement amplitude was affected by G level, indicating altered proprioceptive feedback.
  • Increased dynamic overshoots in 0G suggest reduced muscle spindle activity.

Conclusions:

  • Motor planning for rapid movements is robust to G-level changes.
  • Proprioceptive feedback's reliance on G level influences motor control accuracy.
  • Altered G-loading impacts muscle spindle activity, affecting movement damping.