Physiological Considerations in Open Water Swimming (Part 4)

Among the many physiological responses to swimming in cold water that have been suspected of contributing to the high incidence of deaths in the swim portion of triathlon are three unusual entities: two of which are uncommon (less than 2% of the population), and one which is quite rare. Now, take a deep breath: no […]

Physiological Considerations in Open Water Swimming (Part 3)

The two previous posts outlined the stimulating effects of cold water shock and the fight or flight response, which, when countered with a suppressing effects of the diving reflex, can lead to what is known as an autonomic conflict, causing a higher than normal risk of cardiac arrhythmia, a rare but potentially lethal event in […]

Physiological Considerations in Open Water Swimming (Part 2)

In our last post, we reviewed two important human reflexes that may play a role in open water swim fatalities: The cold water shock response, and the mammalian diving reflex. There are several more: Flight or Flight Response. As an acute stress response, this is essentially a basic survival instinct: a comprehensive neurological discharge of […]