Heart PPt - Cardiac Output Q Sedentary average person Q= SV...

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Unformatted text preview: Cardiac Output Q Sedentary average person Q= SV X HR HR @ rest =70 SV @ rest=70-80 ml Q @ rest=5,000-6,000 ml/min HR @ maximal work = 220-age SV @ maximal work =110-120 Q @ maximal work = 22-24 L/min Blood Volume and Body's Capacity to Hold Blood Blood Volume in the body 5-6 liters Body's capacity to hold blood 12-15 liters If body was filled with blood, 12-15 liters Increased body weight,15-22 lbs more Increased heart size Increased energy to maintain heart Ability to shift blood where it is needed Critical to proper functioning of different tissues and organs Controlled through opening and narrowing vascular beds Narrowing of pre-capillary sphincters -> increased resistance to blood flow ( R=1/r4) Shift blood to venous side through A-V shunts Cardiac Output Endurance Trained HR @ rest = 40-50 SV @ rest = 120-130 ml/min Q @ rest = 5,000 - 6,000 ml/min HR @ max work = 220-age SV @ max work = 150-180 Q @ max work = 30 -35 L Cardiac Hypertrophy Pressure Overload High afterload Increased pressure for LV to work against Increased mass of LV Sarcomeres in parallel No increase in LV volume Can lead to inadequate perfusion of LV and conductance problems Cardiac Hypertrophy Volume overload Endurance exercise Large volume of muscle mass involved Demand for large volume of blood to be pumped Sustained exercise Left Ventricular Hypertrophy Sarcomeres in series Increased volume of LV Increased thickness of LV in proportion to increased radius of LV -Law of Laplace Increased radius-> increased tension on walls ...
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This note was uploaded on 06/17/2008 for the course KIN 324K taught by Professor Farrar during the Fall '08 term at University of Texas.

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