Cardiovascular capacity during exercise Flashcards
What is the best measure of capacity of CV system?
VO2max
what is the best determinant of VO2 max?
cardiac output
vo2 max limited by limit of q
how much can Q increase with endurance training?
what does it account for?
how is that Q achieved for trained athletes vs untrained
20%
increase in VO2 max
from stroke volume
untrained:HR
when does Q increase until during exercise?
until blood flow is sufficient to meet metabolic requirements of exercise.
How much will Q increase for untrained vs trained.
untrained: 5L/min-20L/min
Trained: 5L/min- 35-40L/min
SV of trained/untrained person at rest?
during endurance exercise?
trained: 100ml/beat
untrained: 71ml/beat
during exercise:
trained: 210ml/beat
untrained: 100ml/beat
When is max SV achieved for all individuals?
this is represented by a HR of what?
at 40-50% of VO2max.
110-120bpm.
for athletes Training increases stroke volume by 20% due to what?
decrease in HR increase in ventricular volume thickening of arterial wall Increase in blood volume Increase in myocardial contractility
HR increases linearly with what?
where does it level off?
workload and VO2,
VO2 max
what does rate and amount of HR increase depend on?
type of exercise
Fitness
Gender
why is there decreased resting HR from endurance training?
its due to a decrease in the SNS tone and intrinsic firing rate of SA as well as increase in PNS tone
Why does MAP rise?
to maintain blood flow to critical areas.
What happens to TPR, Q, and MAP during aerobic exercise?
TRP:decreases
Q :increase
MAP: elevates because of vasoconstriction of nonworking muscles
Since athletes have high Q what else is higher than age-matched untrained controls?
SBP
At the immediate termination of aerobic exercise, what will happen to SBP and why?
SBP will decrease due to decrease in stroke volume.
