Why the study?
Does thermal stress (whole-body heating or cooling) affect cardiac function and hemodynamics?
Does thermal stress (whole-body heating or cooling) affect cardiac function and hemodynamics?
Thermal stress significantly alters cardiac hemodynamics, which may mechanistically explain syncope during heat stress and improved orthostatic tolerance during cold stress.
Answers are grounded in this paper and cite their sources.
Thermal stress may explain syncope risk and orthostatic tolerance; leaves open targeted trials on hemodynamic modulation.
Whole-body heating decreases pulmonary capillary wedge pressure and cerebral vascular conductance and causes an inotropic shift in the Frank-Starling curve. Whole-body cooling increases pulmonary capillary wedge pressure and cerebral vascular conductance without changing systolic function. These and other data indicate that factors affecting cardiac function may mechanistically contribute to syncope during heat stress and improvements in orthostatic tolerance during cold stress.
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Wilson et al. (2010) studied this question.
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