Abstract
Background: Baroreflex adaptation to repetitive +Gz has been reported previously. The underlying mechanism may involve different responses of stroke volume (SV) and total peripheral resistance (TPR) to +Gz. Hypothesis: The previously observed enhanced mean arterial pressure (MAP) regulation in fighter pilots (FP) is mediated by increases in SV and/or TPR. Methods: There were 8 pilots and 12 non-pilots who underwent head-up tilt. SV was determined using impedance cardiography. Results: MAP increased significantly in FP, due to heart rate (HR) and TPR increasing more and SV decreasing less. Conclusion: Baroreflex adaptation results in better performance of HR, SV and TPR in response to +Gz.
Original language | English |
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Pages (from-to) | 255-259 |
Number of pages | 5 |
Journal | Aviation Space and Environmental Medicine |
Volume | 71 |
Issue number | 3 |
Publication status | Published - 1 Mar 2000 |
Keywords
- +Gz
- Acceleration
- Adapta tion
- Baroreflex
- Cardiovascular
- Impedance cardiography
- Peripheral resistance
- Postural
- Stroke volume
- Tilt