Abstract
The physiological events that occur in exercising animals or humans provide a unique insight into the function of the cardiovascular system at the limits of its capacity. A typical response to an incremental exercise consists of doubling of the HR, a four- to fivefold increase in CO and a moderate increase in MAP. Under such conditions, the role of central and peripheral circulations becomes more clearly defined and underscores its importance in control of cardiac output. Increased vascular conductance during maximal aerobic exercise significantly exceeds the theoretical pumping capacity of the heart. The “missing blood volume” is supposedly provided by a hypothetical muscle pump, the existence of which, however, has been questioned. Further discussed are metabolic control of muscle blood flow at rest and during activity; exercise hyperemia and functional sympatholysis; the importance of the red blood cells as sensors and modulators of vascular tone and the role of cytoplasmic ATP and endothelial purinergic receptors in local control of muscle perfusion; adaptation of the heart and of the pulmonary circulation to increased exercise blood flows; metabolic activation of muscle blood flows during exercise and the function of the heart as the organ of restraint; and the role of the fibrous pericardium and of myocardial hypertrophy as physiologic response in providing resistance against overdistension during high cardiac throughputs.
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Furst, B. (2020). Cardiovascular Response During Exercise. In: The Heart and Circulation. Springer, Cham. https://doi.org/10.1007/978-3-030-25062-1_17
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