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Related Concept Videos

Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.
Increased Intracranial Pressure l: Introduction01:14

Increased Intracranial Pressure l: Introduction

Intracranial hypertension is a sustained elevation of intracranial pressure (ICP) above 22 mm Hg. In supine adults, normal ICP is ~7–15 mm Hg.The rigid, nonexpandable cranium contains three components—brain tissue, blood, and cerebrospinal fluid (CSF)—that total ~1,700 mL in a typical adult: 1,400 mL brain (~80%), 150 mL blood (~10%), and 150 mL CSF (~10%). According to the Monro–Kellie doctrine, total intracranial volume is effectively fixed. When one component expands, CSF and venous blood...

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Related Experiment Video

Updated: Jul 18, 2026

Coherence between Brain Cortical Function and Neurocognitive Performance during Changed Gravity Conditions
12:29

Coherence between Brain Cortical Function and Neurocognitive Performance during Changed Gravity Conditions

Published on: May 23, 2011

Human cerebral autoregulation before, during and after spaceflight.

Ken-ichi Iwasaki1, Benjamin D Levine, Rong Zhang

  • 1Institute for Exercise and Environmental Medicine, 7232 Greenville Avenue, Suite 435, Dallas, TX 75231, USA.

The Journal of Physiology
|December 23, 2006
PubMed
Summary

Spaceflight does not impair cerebral autoregulation, the brain's ability to regulate blood flow. Studies show that astronauts' cerebral autoregulation is preserved, and possibly even improved, after short-duration space missions.

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Area of Science:

  • Physiology
  • Space Medicine
  • Neuroscience

Background:

  • Microgravity exposure alters fluid distribution and cranial blood vessel pressure, potentially affecting cerebral autoregulation.
  • Impaired cerebral autoregulation is hypothesized to contribute to post-spaceflight orthostatic intolerance.

Purpose of the Study:

  • To test the hypothesis that spaceflight impairs cerebral autoregulation.
  • To investigate changes in cerebral blood flow regulation during and after spaceflight.

Main Methods:

  • Six astronauts were monitored before, during, and after a 16-day space shuttle mission.
  • Beat-by-beat measurements of mean arterial pressure and middle cerebral artery blood flow velocity were taken.
  • Dynamic cerebral autoregulation was quantified using transfer function analysis during simulated standing and upright tilt.

Main Results:

  • Resting cerebral blood flow velocity did not significantly change post-flight.
  • Reductions in cerebral blood flow velocity during lower body suction were less significant after spaceflight.
  • Upright tilt resulted in smaller reductions in cerebral blood flow velocity after spaceflight, indicating preserved regulation.

Conclusions:

  • Short-duration spaceflight appears to preserve, and potentially enhance, human cerebral autoregulation.
  • The findings challenge the notion that spaceflight impairs cerebral autoregulation and suggest mechanisms other than impaired autoregulation may cause orthostatic intolerance.