Acclimating to cold water during an open water race is a crucial component for all open water swimmers and triathletes. That’s because the body heat loss in cold water, for a non-exercising body, can be up to two to four times greater than the heat loss in cold air at the same temperature. When you exercise in cold water, swimming for example, the heat loss from your skin can be 70 times greater than air of equal temperature.
There are two ways to lose heat during cold-water exercise, and these are due to both conduction and convection. Conductive losses are direct losses from one molecule to another through a liquid, solid or gas. Convective losses depend on how fast water (or air) moves past the body.
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