For people suffering from Orthostatic Intolerance, Postural Orthostatic Tachycardia, Mast Cell Activtation or EDS. Follow me as I document my struggle towards better health.

Blood Volume & Orthostatic Intolerance

I found an interesting article on blood volume which states
Microgravity decreases PV (plasma volume) and EV (erythrocyte volume) which contribute to orthostatic intolerance and decreased exercise capacity in astronauts. PV decreases may result from lower set points for total body water and central venous pressure, while EV decreases may result from increased erythrocyte destruction. Trauma, renal disease, and chronic diseases cause anemia from hemorrhage and immune activation which suppresses erythropoiesis. The re-establishment of EV is associated with healing, improved life quality, and exercise capabilities for these injured/sick persons.
It goes on to say:
Erythrocyte volume expansion usually occurs slowly over many weeks to months, whereas plasma volume expansion can occur rapidly over several hours to days.
I have been consuming an extra 8,000mg of salt and 3 litres of water daily for a week now.  Even though I have experienced an immediate increase in "plasma volume" hence my weight gain, to get true benefit from my efforts at increasing total blood volume, including erythrocyte volume, I guess it will take weeks to months.  Soldier On!!

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