Oxygen consumption and maximum pumping performance were measured in situ perfused trout (Salmo gairdneri) hearts at acclimation temperatures of 5° and 15° C. Myocardial oxygen consumption increased linearly as a function of myocardial power output at both acclimation temperatures. The slope of the regression equation was significantly lower at 5° C compared with that at 15° C This difference was attributed to power output related changes in mechanical efficiency at 5° C (but not at 15° C) and a lower mass-specfic oxygen consumption for maximal performance of the larger heart of cold-acclimated fish.
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Graham et al. (1990) studied this question.
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