Kinesiology 2230A/B Lecture 11: Exercise Physiology March 3rd 2017
16 Mar 2017
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If you have a blockage, blood flow is cut off, will be without oxygen. If doing exercise where the heart will require more oxygen. Inactivity: body position and effect on sv, co is the same in all 3 positions. Increase in hr from lying to standing: because heart must work against the hydrostatic pressure, our stroke volume will be lower, fluid in lower must fight gravity. The push back of pressure from aorta on ventricles is known as afterload. Isovolumic contraction: means we have the same volume but there is a contraction, happens in the ventricle when the aorta stays closed, preload and afterload, as afterload increases, cardiac output decrease. Because they are working against a greater afterload: pressure present in the arteries is elevated, so they have to generate greater blood pressures. Any change in the radius of the blood vessels, is going to have a huge effect on pressure. So if radius increases, flow will go up dramatically.
