Being in water for some time makes most people want to pee. This is why I ask aquatic bodywork clients to avoid drinking too much fluid before a session and encourage them to drink plenty of water afterwards.
The dehydrating effect is especially significant for some (see highlight below) as Peggy Schroedinger, Aqua PT explains. I thought this might be of interest here ...
Renal response to immersion in water
Two hormonal changes occur:
- Antidiuretic hormone (ADH) is suppressed resulting in an increase in urine production.
This response increases as the duration of immersion increases up to three hours, and then it slowly begins to taper off.
- Atrial natriuretic peptide (ANP) is increased which
- contributes to diuresis by decreasing sodium reabsorption in the distal renal tubular system
- causes a suppression of thirst
The increase in urine production coupled with the suppression of thirst can lead to significant dehydration, especially in people who are medically at risk and practitioners who spend long periods of time in the water.
Source Peggy Schroedinger, Aqua PT