Originally Posted by
MoAlpha
Reabsorbed from where? Sodium is bound to structural molecules in tissues such as skin and there are pools of extracellular fluid which are hypertonic with respect to plasma. It is believed, with some evidence from animals, that these sodium stores are available to replace sweat losses, but the process is too slow to keep up with plasma dilution due to drinking.
From a NCBI article I think or the NEJM.
I likely used the term re-absorbed incorrectly, but essentially this study showed evidence that some of the salts sweated out were being taken back in. But it did say some participants in the study did show evidence of this and others didn't. I think it was a study involving military personnel as the study group. It was probably 5 or more years ago, so I've no idea how I searched and stumbled across it.
And I just read the abstract which is still above my level.