My understanding is:
Resistance training causes your body to send out a signal(not trying to get to in depth here) that reduces blood flow (vasoconstriction) to non working muscles, and simultaneously promotes blood flow (vasodilates) to the targeted muscle group being worked in order to supply the muscle with more blood for work being performed.
My confusion:
Why are preworkout supps that promote full body vasodilation so highly thought of if they are only working against what your body is trying to promote?
Let me know if i need to explain my point further due to poor wording. Thanks for feedback
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Thread: Pre workout vasodilators
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06-08-2010, 11:26 AM #1
Pre workout vasodilators
"Don't cry because you want to quit, cry because you keep going so hard it hurts. When you want to succeed as bad as u want to breath, THEN you will be successful"
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06-08-2010, 11:29 AM #2
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06-08-2010, 11:33 AM #3
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06-08-2010, 11:37 AM #4
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06-08-2010, 11:48 AM #5
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06-08-2010, 11:48 AM #6
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Working out a specific muscles group decreases blood flow to others?
There is a response that sends more blood to target muscle groups, but I do not think that it decreases bloodflow elsewhere other than digestion slowing down.
That being said...the effects of a pre workout/no supplement would not entirely override your bodys response to exercise. If a supplement enhances full body blood flow, then you will still have the response of an increase in blood flow to the target area...Last edited by Blitz n destroy; 06-08-2010 at 11:55 AM.
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06-08-2010, 11:50 AM #7
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06-08-2010, 11:53 AM #8
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06-08-2010, 12:03 PM #9
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The cardiac output is increased, of course, via sympathetic nerves that increase the heart rate and increase the stroke volume. Also, the stroke volume potentially can increase via the Frank-Starling mechanism. This is because contracting skeletal muscles tend to squeeze blood in their veins back to the central veins via muscle pumping. The elevated pressure in the central veins then in some circumstances can increase the end diastolic volume and thus the stroke volume.
At the same time as skeletal muscle arterioles dilate, arterioles to certain other areas help compensate by constricting. The primary organs for this sympathetic vasoconstriction are the gut, skin and inactive skeletal muscles.
The gut usually can get by with less blood flow because most of the blood flowing to the digestive system is for absorbing food molecules rather than for keeping the organs alive. However, in long-term, endurance exercise, digestion and absorption at some point starts taking place again.
Likewise, blood flow to the skin is not primarily for keeping the skin alive and thus can be reduced, at least for a short while. But reductions in blood flow to the skin are likely to be transient because it is imperative that enough blood flow through the skin to give off the extra heat generated in exercise.
In the end, in a healthy person the mean arterial pressure stays constant. because the increased flow of blood through exercising muscles is compensated for remarkably well by an increased cardiac output and adjustments to arterioles.
Again...I do not think that taking a pre workout product would negate this effect, the body would still be responding the same, just with a greater overall blood flow. Also, even though certain muscles may be inactive by our terms..they still receive secondary stimulation through compound exercise.
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06-08-2010, 12:03 PM #10
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06-08-2010, 08:57 PM #11
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06-08-2010, 09:35 PM #12
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06-08-2010, 09:39 PM #13
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06-10-2010, 02:19 PM #14
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06-10-2010, 02:19 PM #15
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06-10-2010, 02:43 PM #16
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