HESC1501 Lecture Notes - Lecture 14: Hypotension, Exercise Intensity, Cardiovascular Disease
30 Jul 2018
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Lecture 14 - 24/04/18 - acute effects of exercise on the cv response. Responds to: movement, temperature, blood acidity (ph), postural changes (lying vs sitting vs standing), o2 and co2 blood content. Influecenced by fitness: average resting hr ~70 bpm, very fit individuals have low resting hr (<60bpm - training bradycardia, unfit/ill are the opposite (>100bpm - tachycardia, fitness alters autonomic nervous system control. Heart rate increases slightly: anticipation - autonomic nervous system, sympatheic (fight or flight)/parasympatheic (recovery) During exercise: hr increases linearly to match increased power output. Increased work demands more fuel" (atp availability: heartbeats faster helping the blood flow to increase, deliver o2/nutrients faster, reoxygenate the blood. Submaximal: fitness related, for a given workload, hr is lower in trained vs untrained individuals. Maximal: realted to age, tricky to determine (maximal test required e. g beep test, 2 commonly used formulas for apmhr. Instead estimate: 220 - age, 208 - (0. 7x age) - best to use as an ep.
