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Changes in toe clearance during treadmill walking after long-duration spaceflight.

Christopher A Miller1, Brian T Peters, Rachel R Brady

  • 1NASA Lyndon B. Johnson Space Center, Wyle Integrated Science and Engineering Group, TX 77058, USA. chris.miller-1@nasa.gov

Aviation, Space, and Environmental Medicine
|October 7, 2010
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Summary
This summary is machine-generated.

Astronauts show increased tripping risk immediately after spaceflight due to altered gait. Sensorimotor changes affect toe clearance, but this risk normalizes within days.

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Area of Science:

  • Space Medicine
  • Human Physiology
  • Biomechanics

Background:

  • Long-duration spaceflight causes sensorimotor changes in astronauts.
  • Altered gait kinematics post-flight may increase tripping risk.
  • Toe trajectory during locomotion is a key metric for motor control.

Purpose of the Study:

  • To assess astronaut tripping risk after long-duration spaceflight.
  • To evaluate pre- to post-flight changes in toe clearance during treadmill walking.

Main Methods:

  • Ten astronauts walked on a treadmill pre- and post-flight.
  • A visual-acuity task was performed during treadmill walking.

Main Results:

  • Three subjects showed increased tripping risk on landing day (decreased median toe clearance or increased variance).
  • No significant differences in toe clearance were found in later post-flight sessions.
  • Changes in foot pitch, ankle dorsiflexion, and pelvis roll predicted toe clearance changes.

Conclusions:

  • Landing day indicates an increased tripping hazard for astronauts returning to Earth.
  • This risk may be significant in emergency situations immediately post-flight.
  • Crewmembers appeared to re-establish normal walking patterns rather than adopting new strategies.