BHAN435 Lecture Notes - Lecture 6: Harvard Step Test, Mcgraw-Hill Education, Cardiac Output
22 Feb 2017
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Measuring aerobic fitness: cardiorespiratory fitness (crf, ability of the heart, lungs, and blood vessels to deliver adequate amounts of oxygen to the muscle cells in order to meet the demands of prolonged pa or exercise. Just being active on a daily basis is important: key terms, heart rate (bpm) Age predicted max hr = 220 age: stroke volume (ml/beat) Amount of oxygenated blood ejected from the left ventricle during ventricular contraction: cardiac output (l/min) Total amount of oxygenated blood ejected form the left ventricle every minute. Cardiac output = hr x sv: typical resting and maximal values for hr, sv, and cardiac output for 20 yr/o untrained and endurance trained subjects. Image below adapted from: powers sk & howley et. Amount of oxygen utilized by the body at rest and submaximal pa: maximal oxygen uptake (v02 max) Maximum amount of oxygen brought in and utilized by the body during progressive exercise. Direct assessment: directly measures 02/c02 gas exchange, mask test.
