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Jolie,


> Blood flow and its distribution underwater are not much affected 
> by posture. The effect of gravity is reduced underwater (gravity is 
> not reduced, just its effect due to buoyancy). In one experiment we 
> did at the Biokinetics Research Lab at Temple U and reported in 
> Undersea Biomedical Research (1991 I think - I have to look it up - 
> it's not listed in Medline) we measured blood volume changes with 
> different postures. Large effect in the air due to gravity. But not 
> underwater. Blood floats out of the lower limbs regardless of posture
> similar to the effect observed in spacecraft during microgravity.
> Also, blood flow wouldn't have to stop entirely to result in a 


Would you, or anyone else, care to comment about the likelihood of a 
vasovagal episode while diving?  

Philip Weissman

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