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Articles in PresS, published online ahead of print January 3, 2002
Am J Physiol Heart Circ Physiol, 10.1152/ajpheart.00899.2001
Submitted on October 16, 2001
Accepted on December 28, 2001
1 Institute for Exercise and Environmental Medicine, Presbyterian Hospital of Dallas, Dallas, Texas, USA
2 Institute for Exercise and Environmental Medicine, Presbyterian Hospital of Dallas, Dallas, Texas, USA; Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA
* To whom correspondence should be addressed. E-mail: crandall{at}email.swmed.edu.
The purpose of this project was to test the hypothesis that baroreceptor modulation of muscle sympathetic nerve activity (MSNA) and heart rate is altered during the cold pressor test. Ten subjects were exposed to a cold pressor test by immersing a hand in ice water for 3 min while arterial blood pressure, heart rate, and MSNA were recorded. During the second and third minute of the cold pressor test, blood pressure was lowered and then raised by intravenous bolus infusions of sodium nitroprusside and phenylephrine HCl, respectively. The slope of the relationship between MSNA and diastolic blood pressure was more negative (p<0.005) during the cold pressor test (-244.9 ± 26.3 units/beat/mmHg) when compared with control conditions (-138.8 ± 18.6 units/beat/mmHg); whereas no significant change in the slope of the relationship between heart rate and systolic blood pressure was observed. These data suggests that baroreceptors remain capable of modulating MSNA and heart rate during a cold pressor test, however, the sensitivity of baroreflex modulation of MSNA is elevated without altering the sensitivity of baroreflex control of heart rate.
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