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High sustained +Gz acceleration: physiological adaptation to high-G tolerance
1Physiology Research Section, Air Force Research Laboratory, Brooks Air Force Base, TX 78235, USA.
Journal of Gravitational Physiology : a Journal of the International Society for Gravitational Physiology
|September 7, 2001
Summary
Regular high-G exposure training improves pilot G tolerance by enhancing cardiovascular adaptation and blood pressure regulation. Conversely, G-layoff reduces G endurance, impacting performance during sustained high-G acceleration.
Area of Science:
- Aerospace Medicine
- Cardiovascular Physiology
- Human Performance
Background:
- High-G acceleration impacts pilot's cerebral perfusion and consciousness.
- Understanding G-induced loss of consciousness drives protective technology and training.
- Research has focused on acute high +Gz acceleration effects.
Purpose of the Study:
- Review new data on physiological adaptations to repeated high-G exposure.
- Investigate the 'G-training' effect on cardiovascular adaptation.
- Examine the impact of G-layoff on G tolerance.
Main Methods:
- Review of new data from three experiments.
- Analysis of physiological adaptations to sustained high +Gz acceleration.
- Assessment of blood pressure regulation and cerebral perfusion.
Main Results:
- Repeated high-G exposure induces significant physiological adaptations.
- These adaptations improve blood pressure regulation.
- Improved regulation enhances cerebral perfusion protection during orthostatic challenges.
Conclusions:
- Chronic high-G exposure leads to beneficial cardiovascular adaptations.
- These adaptations contribute to enhanced G tolerance.
- G-training may be crucial for maintaining pilot performance under high-G conditions.