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Cerebral hypoperfusion precedes nausea during centrifugation
Jorge M Serrador1, Todd T Schlegel, F Owen Black
1Harvard Medical School, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA. serrador@hms.harvard.edu
Aviation, Space, and Environmental Medicine
|March 4, 2005
Summary
Reductions in cerebral blood flow precede nausea development in motion sickness. This finding suggests cerebral hypoperfusion may predict susceptibility to motion sickness.
Area of Science:
- Neuroscience
- Aerospace Medicine
- Physiology
Background:
- Nausea and motion sickness pose significant challenges for aviators and astronauts.
- Understanding motion sickness mechanisms is crucial for developing effective countermeasures.
- This study investigates the link between cerebral blood flow and nausea onset.
Purpose of the Study:
- To determine if changes in cerebral blood flow precede the development of nausea in motion sickness-susceptible individuals.
- To investigate the role of cerebral hypoperfusion in motion sickness.
Main Methods:
- Subjects underwent centrifuge rotation, simulating motion sickness triggers.
- Cerebral blood flow velocity (middle cerebral artery), blood pressure, and end-tidal CO2 were measured using transcranial Doppler.
- Centripetal acceleration was applied in the nasal-occipital plane.
Main Results:
- Subjects developing nausea showed significant increases in blood pressure and cerebrovascular resistance before symptom onset.
- A marked decrease in cerebral blood flow velocity preceded nausea development.
- Individuals resistant to motion sickness did not exhibit these changes.
Conclusions:
- Reduced cerebral blood flow precedes the onset of nausea.
- Cerebral hypoperfusion may be a predictor for motion sickness susceptibility.
- Further research is needed to elucidate the role of cerebral hypoperfusion in motion sickness.