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Am J Physiol Regul Integr Comp Physiol (February 22, 2007). doi:10.1152/ajpregu.00884.2006
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Submitted on December 20, 2006
Accepted on February 20, 2007

Venous hemodynamic responses to acute temperature increase in the rainbow trout (Oncorhynchus mykiss).

Erik Sandblom1* and Michael Axelsson1

1 Zoology, Zoophysiology, Göteborg, Sweden

* To whom correspondence should be addressed. E-mail: erik.sandblom{at}zool.gu.se.

Many ectotherms regularly experience considerable short-term variations in environmental temperature which affects their body temperature. Here we investigate the cardiovascular responses to a stepwise acute temperature increase from 10 to 13 and 16°C in rainbow trout. Cardiac output (Q) increased by 20 and 31% at 13 and 16°C, respectively. This increase was entirely mediated by an increased heart rate (fH), whereas stroke volume (SV) decreased significantly by 20% at 16°C. The mean circulatory filling pressure (MCFP), a measure of venous capacitance, increased with temperature. Central venous pressure (Pven) did not change, whereas the pressure gradient for venous return (MCFP-Pven) was significantly increased at both 13 and 16°C. Blood volume (Vbl), as measured by the dilution of 51Cr-labeled red blood cells, was temperature insensitive in both intact and splenectomised trout. This study demonstrates that venous capacitance in trout decreases, but cardiac preload as estimated by Pven does not change when Q increases during an acute temperature increase. SV was compromised in trout as fH increased with temperature. The decreased capacitance likely serves to prevent passive pooling of blood in the venous periphery and to maintain cardiac filling pressure and a favourable pressure gradient for venous return.




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