Quote Originally Posted by Sharla View Post
Have you found anything about why the heart is more efficient when the body is horizontal other than it not pumping against gravity?

I've only so far found one article on how blood plasma volume is reduced with bed rest - maybe related somehow to hydration ? - which especially in muscular men might be related to K deficiency - which may be related to muscle acidification and resistance to fatigue and the lactate shuttle - all pretty sparse links so far though and I have to double check everything before I embarass myself by posting anything

I've also decided the lactate shuttle might be related to your ability to think during intese exercise but I've really got to read more to completely understand it I think!
I'm guessing it is because your body isn't fighting gravity anymore, so the main "leak" of energy from your system is basically removed. Your hearts no longer having to push blood from your toes up to your heart and no longer up to your brain.

Oh and forgot to mention your cardiac system is a large user of lactate as energy, such as the heart. And I did find info considering it a pseudo hormone. But sorry don't have the time supposed to b packing my bags as I type Hopefully when I get back you'll have solved the riddle.