Exercise-Associated Hyponatremic Encephalopathy in an Endurance Open Water Swimmer In general, it is known that its too high fluid supply during physical load leads to a dilution hyponatremia, in plain text, the sodium decreases in the blood. If you drink too much - because it is hot and / or because it is said to drink a lot to do not dehydrate - can have the serious consequences.An Australian research group has a fall of a long-distance swimmer at a 20 km swimming in the ocean. The too high fluid intake led to a stress-associated hyponatrominic encephalopathy with change in the state of consciousness.The sodium was 119 mmol / l at this time. She had to be monitored intensive care in the hospital, but then could go home healthy.
Although such cases are relatively rare, it shows that an uncontrolled fluid intake can have serious consequences. The case report can be found under https://pubmed.ncbi.nlm.nih.gov/25443755/