Abstract
1. 1. After stressful exercise in trout, plasma pH and bicarbonate levels decrease while plasma catecholamines, lactate and cortisol levels increase. 2. 2. A perfused working trout heart was used to examine the effect of low bicarbonate and elevated lactate levels during extracellular acidosis (pH 7.4) with and without adrenergic stimulation. 3. 3. Adrenergic stimulation completely ameliorated the predominantly negative chronotropic effect of low bicarbonate acidosis. 4. 4. Exogenous glucose (10mmol/l) or lactate (5 mmol/1) were equally effective as an exogenous fuel to support maximum cardiac performance under control conditions and with low bicarbonate acidosis. 5. 5. We conclude that elevated plasma catecholamines and lactate, but not necessarily elevated plasma cortisol or calcium, contribute to maintaining maximum cardiac performance during an extracellular acidosis similar to that found following stressful exercise.
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