HESC1501 Lecture Notes - Lecture 16: Bradycardia, Hematocrit, Vasoconstriction
1 Aug 2018
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Document Summary
Two goals of aerobic training: develop functional capacity of the cardiovascular system, enhance aerobic capacity of the muscles. Cardiovascular adaptations (blood characteristics and heart physiology) resulting from endurance training. Plasma volume increase 9-25% 200 - 300ml increase. Cardiovascular adaptions (hr, sv, q) resulting from endurance training. Mechanisms of exercise induced decrease in heart rate: trained individuals have lower resting heart rates and lower heart rates at submaximal workloads, bradycardia. Improved neural tone: more parasympathetic control, the heart is able to pump the same amount of blood around the body with fewer contractions. Cardiac output increases in maximal work may decrease at rest or submax in fitter individuals. Overall not much change at rest or submaximal exercise. Evidence of lowered bp: hypertensive patients, 12 week walking program (10,000 steps/day, sbp and dbp lowered, lf is a measure of the sympathetic control of the heart, sympathetic control is lowered with training. Metabolic adaptions to endurance training (in relation to o2 and muscle)
