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Related Experiment Videos

Cardiovascular responses to KC-135 hyper-gravity.

H Satake1, W J Becker, S J Wood

  • 1Dept. Neurophysiology, Inst. Equilibrium Res., Gifu Univ. Sch. Med., Japan.

Acta Astronautica
|July 1, 1994
PubMed
Summary
This summary is machine-generated.

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This study investigated cardiovascular responses to hypergravity, finding that angular velocity had minimal impact. Otolith signals may influence responses, but this effect varies individually.

Area of Science:

  • Aerospace Medicine
  • Human Physiology
  • Vestibular System

Background:

  • Cardiovascular responses to altered gravity are crucial for spaceflight.
  • The roles of angular velocity and otolith input in these responses require further clarification.

Purpose of the Study:

  • To determine if angular velocity affects cardiovascular responses during hypergravity exposure.
  • To examine how otolith signals modify cardiovascular responses under hypergravity stress.

Main Methods:

  • Utilized NASA/KC-135 hypergravity flight for +1.8Gz exposure.
  • Six healthy subjects underwent neck dorsal flexion to reduce otolith input.
  • Monitored systolic blood pressure, diastolic blood pressure, and R-R interval.

Main Results:

Keywords:
NASA Center JSCNASA Discipline CardiopulmonaryNASA Discipline Number 16-10NASA Program Space Physiology and Countermeasures

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  • Hypergravity exposure significantly increased systolic and diastolic blood pressure, narrowing pulse pressure.
  • Tachycardia was observed in most subjects during hypergravity.
  • Cardiovascular responses were similar to studies with short rotating radii, suggesting minimal angular velocity effect.

Conclusions:

  • Angular velocity appears to have a negligible effect on cardiovascular responses during hypergravity.
  • Reduced otolith input might influence cardiovascular responses, but this effect is not systematically observed.
  • Individual subject variability likely plays a significant role in vestibular influence on cardiovascular responses.