Cold Diuresis
Ever wondered why you per a lot when you do open water swimming?
Don't worry, you're not alone.
It is reckoned to be due to something called 'cold diuresis' although the phenomenon is not fully understood.
It’s believed that, when your body temperature drops due to submersion in cold water, in an attempt to reduce heat loss the body will constrict blood vessels and reduce blood flow to the surface of the skin.
This causes blood pressure to rise which results in the kidneys pulling out excess fluid to reduce your blood pressure.
The result of allvof these physiological miracles is that you pee, and pee, and pee again!
The other thing you notice is that it becomes perfecttly acceptable to do so and open water swimmers dont bat an eye lid if you announce you need a pee stop, so don't worry, do it!