vic2005
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| | 11/23/05 - 10:39 PM
1 of 1 forum leaders found this post helpful
| #1 |
What situation can you have this? Increased Arterial pressure and increased cardiac rate, but normal Pa02 and Paco2 ?
a) aerobic exercise
b) slow wave sleep
C) supine position
d) high altitude
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| Doc2378
Forum Guru
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aerobic exercise?
Sleep would cause mild acidosis
Supine position should dec heart rate (compared to standing)
High altitute should decrease PaO2 and increase PaCo2
What do you think?
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| sturge_weber
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i too think aerobic exercise
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| prader-willi
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aerobic exercise.....i assume
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| sturge_weber
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the logic...
during exercise nothing will happen to the pao2 and paco2 which re the dissolved gases in the blood, but when we exercise the peripheral resistance will increase due to the ne released and hence the arterioles will constrict, raising the arteial pressue and also the ne will cause heart rate to increase....
hence aerobic exercise
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| reet
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i m confused here,, i know its stupid ques,i m asking
its about excercising muscle and NE (peripheral vasoconrictions)..is this vaso constriction in others organs?or it cant be in excercising ms ,right????????
can anybody explain vasocontriction during excercising muscle( aerobics)???
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| sturge_weber
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hey reet
its like this, when we exercise the organ that is working needs more blood supply, hence there will be vasodilation in that organ, but at the same time ne will also be released so that there will be vasoconstriction in the rest of the body, this will increase the cardiac output too...
hence whereas the exercising muscle has dilated its arteries, to increase its blood supply, as more o2 needed to increase work in the exercising muscle, the body will also release ne, that will vasoconstrict the arteries of the rest of the body, this will help increase the cardiac output...
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| sturge_weber
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and ya , when the whole body is exercising, the whole body arteries will dilate, as blood flow needs to be increased in the whole body, plus this the ne will be released by the body which will increase the H.R and hence the cardiac output, but the blood pressure will remain almost the same, as map=c.o x tpr..
as the whole body is exercising the arteries in the whole body dilate, bringing down the tpr, but the H.R increases due to ne, and hence the map will remain the same
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| Geroo
Forum Guru
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the key point is : NE has no effect on exercising muscle,during exercise alfa receptors become unresponsive to NE.
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| Doc2378
Forum Guru
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I think the selective vasoldilation in exercising muscles is actually mediated by the release of local metabolites/ mediators by exercising muscles, rather than they being refractory to NE...
...but I guess its not important WHO does it as long as we know it happens!
also...lets not forget the cholinergic symp response on sweat glands...these arterioles are also vasodilated!
Hope you got your question answered Reet
Cheers!!!
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Courage does not always ROAR. Sometimes courage is the quiet voice at the end of the day saying, "I will try again tomorrow" - Mary Anne Radmacher
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| Geroo
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it's both
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| cyra
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I'd just like to point out the following...
During exercise there is vasodilation of the skeletal muscle vasculature...(due to the local metabolites and in part also due to the unresponsiveness of alpha rec to NE)...this vasodilation causes a drop in the total peripheral resistance which in turn decreases the blood pressure...this drop in pressure is detected by the baroreceptors which then send impulses to the heart to increase heart rate,stroke volume and therefore the cardiac output and the blood pressure then increases...
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| sturge_weber
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ok i have a point to add too, that is that the exercising muscle will dilate, take for example we re painting, then the hand skeletal muscle will vasodilate, and ne will not act there, but the body will release ne to which the body will respond, not the exercising muscle, and the net result will be that the tpr of the body will increase and so will the co. and so will the mean arterial pressure
but now we take an example of full body exercise, the whole body skeletal muscle will dilate, and now the ne will not act on any muscle, buit will only be able to act on the heart, and increase the c.o.. so now in this case the due to vasodilatation in the musculature of whole body, the tpr will decrease but the c.o will increase, as a result the mean arterail pressure will not increase....
so we lead to the conclusion that whole body exercise the map will not change much, or will be pretty stable but in exercise like painting, the map will increase..
hope this helps
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| reet
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 i got the answer ...
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