Journal article
A cardiovascular model for studying impairment of cerebral function during +Gz stress
Aviation, Space, and Environmental Medicine, Vol.55, pp.24-31
01 Jan 1984
Abstract
A digital computer model of the human cardiovascular system has been developed which can be used for studying impairment of cerebral function during +Gz stress. The model includes simulation of the arterial and venous systems, the heart, baroreceptor control of heart rate, control of venous tone, and the effect of gravity. Model predictions suggest that, for unprotected subjects, carotid pressure at eye level decrases to 50 mm Hg (beginning of peripheral light loss) at approximately 2.7 Gz. The pressure decreases to 20 mm Hg (beginning of central light loss) at approximately 3.6 Gz. An anti-G suit provides an extra 1.1 to 1.5 Gz protection. Even though blood pressure supplying retinal vessels drops significantly at the above G levels, cerebral blood flow is maintained due to protective and compensatory mechanisms. These observations compare favorably with results reported in the literature. The results suggest that this model can be used to improve our understanding of the cardiovascular system's response to +Gz stress.
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Details
- Title
- A cardiovascular model for studying impairment of cerebral function during +Gz stress
- Creators
- D JaronT MooreC-L Chu
- Publication Details
- Aviation, Space, and Environmental Medicine, Vol.55, pp.24-31
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- School of Biomedical Engineering, Science, and Health Systems; [Retired Faculty]
- Identifiers
- 991019173539304721