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Old 06-03-2014
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Help End diastolic pressure during Exercize

Hi, im kind of confused here.
why during EXERCISE do we have a NORMAL left ventricle end diastolic pressure?
we are having increased preload leading for the pressure to be increased, so i dont get why NORMAL.
please someone explain.
thanks!!
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Last edited by drpisho; 06-03-2014 at 01:37 PM.
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Old 06-03-2014
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My understanding is LVEDP stays same because of incresed contractility during exercise. SV increases and End Systolic Volume decreases. One of the main determinants of LVEDP is LVEDV ( End systolic Volume+ Blood comes from left atrium) so even if preload increases LVEDP stays same. By the way this is just my understanding and it helps me memorize it but under physiologic norms it might be wrong.
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Old 06-03-2014
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Quote:
Originally Posted by drpisho View Post
Hi, im kind of confused here.
why during EXERCISE do we have a NORMAL left ventricle end diastolic pressure?
we are having increased preload leading for the pressure to be increased, so i dont get why NORMAL.
please someone explain.
thanks!!
drpisho

To meet your muscles’ increased oxygen demand, all these factors increase during exercise. To create more space for the increased blood flow during exercise, your arteries dilate so diastolic blood pressure remains the same.
During aerobic exercise, systolic pressure should gradually increase as your heart beats harder and faster and your arteries contract to pump more oxygen-rich blood.However, because the arteries in your working muscles start to dilate rather than constrict, the net result is little change in your diastolic pressure.
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Old 06-04-2014
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thanks both for answering!!

BarisOlten i got it pretty clear now!! LVEDP remains unchanged cause even though having a decreased end systolic volume with the increased cardiac output due to the increased preload they both cross each other therefore unchanged, hope im right!!
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