Regional blood flow changes in response to near maximal exercise in ponies: A review

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Abstract
Cardiovascular response in near maximally exercised galloping ponies (heart rate 225 .+-. 7 beats per min; whole body O2 consumption 122 .+-. 12 ml/min per kg) comprised a marked increase in blood flow to the cerebellum, myocardium, diaphragm and the working muscles, while renal blood flow decreased precipitously. Cerebral and brainstem perfusion did not vary from resting values. Transmural homogeneity of myocardial blood flow persisted during near maximal exercise. It was reported that tachycardia or exercise contributed about 1/3 of the total increment in left ventricular coronary blood flow. Considerable unutilized coronary vasodilator capacity was demonstrated in near maximally exercised ponies and maximally exercising ponies were not limited from further exertion because of the coronary circulation.