AJP - Heart Calcium Transients and Cell-Sarcomere
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Am J Physiol Heart Circ Physiol (April 11, 2008). doi:10.1152/ajpheart.01369.2007
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Submitted on November 27, 2007
Accepted on April 10, 2008

Wave reflection augments central systolic and pulse pressures during facial cooling

David G. Edwards1*, Matthew S. Roy1, and Raju Y. Prasad2

1 Department of Health, Nutrition, and Exercise Sciences, University of Delaware, Newark, Delaware, United States
2 Newark, Delaware, United States; Department of Health, Nutrition, and Exercise Sciences, University of Delaware, Newark, Delaware, United States

* To whom correspondence should be addressed. E-mail: dge{at}udel.edu.

Cardiovascular events are more common in the winter months possibly due to hemodynamic alterations in response to cold exposure. The purpose of this study was to determine the effect of acute facial cooling on central aortic pressure, arterial stiffness, and wave reflection. Twelve apparently healthy subjects (age 23 ± 3 years, 6 men, 6 women) underwent supine measurements of carotid-femoral pulse wave velocity (PWV), brachial artery blood pressure, and central aortic pressure (via the synthesis of a central aortic pressure waveform by radial artery applanation tonometry and generalized transfer function) during a control trial (supine rest) and a facial cooling trial (0°C gel pack). Aortic augmentation index (AI), an index of wave reflection, was calculated from the aortic pressure waveform. Measurements were made at baseline, 2 minutes, and 7 minutes during each trial. Facial cooling increased (p<0.05) peripheral and central diastolic and systolic pressures. Central systolic pressure increased more than peripheral systolic pressure (22 ± 3 vs. 15 ± 2 mmHg, p<0.05) resulting in decreased pulse pressure amplification ratio. Facial cooling resulted in a robust increase in AI and a modest increase in PWV (AI, -1.4±3.8 vs. 21.2±3.0 and 19.9±3.6%; PWV, 5.6±0.2 vs. 6.5±0.3 and 6.2±0.2 m-sec-1p<0.05). Change in mean arterial pressure but not PWV predicted the change in AI suggesting that facial cooling may increase AI independent of aortic PWV. Facial cooling and the resulting peripheral vasoconstriction are associated with an increase in wave reflection and augmentation of central systolic pressure potentially explaining ischemia and cardiovascular events in the cold.







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