Open-Water Swimming Isn't Always the Healthy Option

There has been a growing enthusiasm for the 'health benefits' of wild-water swimming. There is, however, a condition that can potentially threaten fit and healthy folk engaged in such activity (https://www.theguardian.com/lifeandstyle/2023/jan/09/research-dangerous-condition-open-water-swimmers-sipe). The condition is called Swimming-Induced Pulmonary Oedema (or SIPE, using US spelling). SIPE results in fluid build up in the heart and lungs. It has been described as 'drowning from the inside'. SIPE is thought to be caused by a combination of exertion, immersion and cold, increasing pressure on blood vessels. This forces fluid, out of the blood, into the tissues. SIPE seems to be surprisingly common. It, rather than drowning, may account for a majority of deaths in wild-water swimmers. About 1 in 200 participants in Sweden's annual Vansbro swim, get SIPE. The same is true of 1 in 20 young men, undergoing selection for membership of the US Navy Seals. Risk factors for SIPE include age, having a high blood pressure, being female and swimming in particularly cold water. Rather obviously, wild-water swimmers (especially those who only do it as a Boxing Day dare), must be given more information on this potential condition and its signs. There is, however, 'no point in throwing the baby out with the bathwater'. Exercise is generally beneficial.