UMass Amherst KIN 470 - 3:13:14 kin 470 class notes (2 pages)

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3:13:14 kin 470 class notes



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3:13:14 kin 470 class notes

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Pages:
2
School:
University of Massachusetts Amherst
Course:
Kin 470 - Exercise Physiology

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3 13 14 kin 470 class notes End diastolic volume o Frank Starling mechanism Greater EDV results in a more forceful contraction Due to stretch of ventricles o Dependent on venous return o Venous return increased by Venoconstriction Via SNS Respiratory pump Changes in thoracic pressure pull blood toward heart Skeletal muscle pump Skeletal muscle pump o Skeletal muscle pump Rhythmic skeletal muscle contractions force blood in the extremities back toward the hart One way valves in veins prevent backflow of blood Average aortic pressure o Aortic pressure is inversely related to stroke volume Represents afterload o High afterload results in decreased stroke volume o Requires greater force Ventricular contractility o Increased contractility increase SV Circulating epinephrine and norepinephrine Increase force of contraction in heart Increases the amount of Ca in the heart muscle Physical characterisitics of blood o Plasma o Hematocrit Relationships among pressure resistance and flow o Blood flow Directly proportional to the pressure difference between the two ends of the system o Inversely proportional to resistance o Blood flow change in pressure resistance Hemodynamics o Resistance o Depends upon Length of vessel Viscosity of blood Radius of the vessel most important Regulation of local blood flow during exercise o Skeletal muscle vasodilation Autoregulation Blood flow increased to meet metabolic demands oxygen delivery during exercise o oxygen demand by muscles during exercise is 15 25x greater than at rest increased changes in cardiac output during exercise o cardiac output increases due to increased HR linear increase to mac Max HR 220 age years o Increased SV Increases at different rates No plateau in highly trained subjects o



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