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Face cooling increases blood pressure during central hypovolemia
Blair D Johnson1, James R Sackett1, Suman Sarker1
1Center for Research and Education in Special Environments, Department of Exercise and Nutrition Sciences, University at Buffalo, Buffalo, New York.
Summary
Face cooling effectively raises blood pressure during central hypovolemia. This intervention increases cardiac output and vascular resistance, mitigating blood pressure drops.
Area of Science:
- Cardiovascular Physiology
- Thermoregulation
- Human Physiology
Background:
- Reduced central blood volume can cause cardiovascular decompensation and blood pressure failure.
- Face cooling (FC) with ice water is known to elevate blood pressure.
- FC may counteract blood pressure decreases during central hypovolemia.
Purpose of the Study:
- To test if face cooling (FC) during lower-body negative pressure (LBNP)-induced central hypovolemia increases blood pressure.
- To investigate the physiological mechanisms underlying the effect of FC on blood pressure during hypovolemia.
Main Methods:
- Ten healthy participants underwent two randomized LBNP trials.
- LBNP was applied at 30 mmHg for 6 minutes, followed by 15 minutes of LBNP.
- Face cooling (ice water) or a sham (thermoneutral water) was applied to the face during LBNP.
Main Results:
- Face cooling significantly lowered forehead temperature compared to sham.
- Mean arterial pressure was significantly higher during LBNP+FC than LBNP+Sham.
- Cardiac output and forearm cutaneous vascular resistance increased during LBNP+FC.
Conclusions:
- Face cooling during central hypovolemia increases blood pressure.
- The blood pressure increase is mediated by enhanced cardiac output and vascular resistance.
- FC is a potential intervention to manage blood pressure during hypovolemic states.
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