cardiovascular system; cardiac output and fitness Flashcards
two factors of cardiac output
heart rate (beats/min)
stroke volume (# blood forced out heart with each heartbeat)
cardiac output + fitness how to measure
amount of blood pumped by heart is referred to cardiac output
how cardiac output is calculated
volume of blood pumped from each ventricle per unit time
cardiac output = stroke volume x heart rate
mesure of cardiac output
it is the measure of the level of oxygen delivery
avg stroke volume + heartbeat
avg stroke = 70 mL
avg resting heart = 70 beats/min
cardiac output = 70 mL x 70 beats/min -> 4900mL/min
avg blood amount of person
4.5-5.5 L of blood in body
total volume of blood in body circulates through heart/min
heart rate and fitness
low resting heartrate is an indicator of physical fitness
heart volume = high
Max heart rate
heart rate that’s the highest you can attain during all physical effort
value diminishes when older
recovery time
indicator used to measure physical fitness
time it tales for the heart rate to return to resting after physical
activity
time = lower when
lower when individual is fit
stroke volume + fitness affected by
1
how easily heart fills with blood
->determined by the volume of blood returning to heart from veins
->elasticity of ventricles
stroke volume + fitness affected by
2
how readily the heart empties again
->determined by strength of ventricular contraction
->pressure exerted by artery walls
stroke volume increases by…
cardiovascular exercise, by enlarging the ventricular chambers + increases of elasticity and strengthens ventricular walls which:
gives heart more power to push out blood
-> from each contraction
max heart rate is not related to
physical fitness
related to age
