Lecture 12- Control of Cardiac Output Flashcards
cardiac output
volume of blood ejected by each ventricle per minute
heart rate
number of heart beats per minute
stroke volume
volume of blood ejected by each ventricle per beat
formulae for cardiac output
heart rate x stroke volume
how does cardiac output increase when we exercise
both heart rate and stroke volume increases
what is the average cardiac output at rest
5 L/min
what is the average heart rate at rest
70 bpm
what is the average stroke volume at rest
70ml
what is the average cardiac output during exercise
20 L/min
what is the average heart rate during exercise
190bpm
what is the average stroke volume during exercise
105 ml
How would HR and SV in endurance athletes compare to general population at rest?
Lower heart rate and higher stroke volume
Physiological Left Ventricular Hypertrophy
Heart undergoes heart adaptations: increase in heart and chamber size (allows more blood to fill) and muscle mass of left ventricle
which group of people is Physiological Left Ventricular Hypertrophy most common in
athletes
what is the average athletes cardiac output at rest
5.5 L/min
what is the average athletes heart rate at rest
40 bpm
what is the average athletes stroke volume at rest
140 ml
what is the average athletes cardiac output during exercise
40 L/min
what is the average athletes heart rate during exercise
190 bpm
what is the average athletes stroke volume during exercise
210 ml
what is the average weight of a heart in grams
300
what is the average weight of an athletes heart in grams
500 grams
chronotropic effects
factors that affect heart rate
autonomic innervation
modifies intrinsic rate (speeds up or slows down)