Adrenergic, respiratory, and cardiovascular effects of core cooling in humans

Steven M. Frank, Michael S. Higgins, Lee A. Fleisher, James V. Sitzmann, Hershel Raff, Michael J. Breslow

Research output: Contribution to journalArticlepeer-review

Abstract

The adrenergic, respiratory, and cardiovascular responses to isolated core cooling were assessed in awake human subjects. Mild core hypothermia was induced by intravenous infusion of 30 or 40 ml/kg of cold saline (4°C) on 2 separate days. A warm intravenous infusion (30 ml/kg, 37°C) was given on a third day as a control treatment. Mean norepinephrine concentration increased 400% and total body oxygen consumption increased 30% when core temperature decreased 0.7°C. Mean norepinephrine concentration increased 700% and total body oxygen consumption increased 112% when core temperature decreased 1.3°C. Core cooling was associated with peripheral vasoconstriction and increased mean arterial blood pressure, whereas heart rate was unchanged. Plasma epinephrine and cortisol concentrations were unchanged during core cooling. There were no changes in any measured parameter with the warm infusion. These findings suggest that mild hypothermia induced by isolated core cooling is associated with an adrenergic response characterized by peripheral sympathetic nervous system activation without a significant adrenocortical or adrenomedullary response. The respiratory and cardiovascular responses to core cooling are characterized by a shivering- induced increase in metabolic rate, norepinephrine-mediated peripheral vasoconstriction, and increased arterial blood pressure.

Original languageEnglish (US)
Pages (from-to)R557-R562
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume272
Issue number2 41-2
DOIs
StatePublished - 1997

Keywords

  • epinephrine
  • hemodynamic
  • hypothermia
  • metabolism
  • norepinephrine
  • thermoregulatio n

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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