08-28-2008, 05:19 PM | #1 |
Senior Member
Join Date: Aug 2005
Location: the far corner of my mind
Posts: 8,711
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heart questions
A couple of random wonderings while riding this morning.
First, is the heart’s response to muscular exertion triggered by a chemical or a neurological signal? I know adrenalin can cause the HR to jump, but doesn’t it then stay elevated for a while? If chemical, are there “on and off” signals and are they limited in amount, meaning response gets weaker if used repeatedly in a short time frame? If neurological how does the cell demand for oxygen etc. get translated into a neurological signal? Second, is the heart muscle susceptible to glycogen depletion like any other muscle? If you are on a no carb diet, for example, can the heart deplete its stored glycogen and if so what effect does this have on the heart’s performance?
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Sorry for th e tpyos. |
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