Parks C M, Manohar M
Equine Vet J. 1985 Jul;17(4):311-3. doi: 10.1111/j.2042-3306.1985.tb02506.x.
In recent years, increasing attention has been focused on the physiological responses of the horse to maximal exercise. Cardiovascular response in near maximally exercised galloping ponies (heart rate 225 +/- 7 beats/min; whole body oxygen consumption 122 +/- 12 ml/min/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 of exercise contributed about one-third of the total increment in left ventricular coronary blood flow. Considerable unutilised coronary vasodilator capacity was also demonstrated in near maximally exercised ponies and it was suggested that maximally exercising ponies were not limited from further exertion because of the coronary circulation.
近年来，人们越来越关注马在最大运动强度下的生理反应。接近最大运动强度飞奔的小马的心血管反应（心率225±7次/分钟；全身耗氧量122±12毫升/分钟/千克）包括流向小脑、心肌、膈肌和工作肌肉的血流量显著增加，而肾血流量急剧下降。大脑和脑干灌注与静息值无差异。在接近最大运动强度时，心肌血流的跨壁均匀性持续存在。据报道，运动性心动过速约占左心室冠状动脉血流量总增量的三分之一。在接近最大运动强度的小马中也显示出相当大的未利用冠状动脉扩张能力，并且有人提出，最大运动强度的小马不会因为冠状动脉循环而限制进一步的运动。
