You can get dehydrated in the cold or when swimming. FACT When exercising in cold environments, respiratory water loss increases because of the low humidity and increased ventilation rate. Additionally, under all your clothing keeping you warm, it’s possible for sweat rates to exceed 33 ounces per hour. When swimming, if internal body temperature exceeds the sweat threshold, you will sweat (even if you don’t feel it because you are already wet). You may also find yourself needing to urinate more often when swimming due to the increase in plasma volume that occurs during immersion from high pressure baroreceptors. This may increase risk for dehydration. Make sure to stay up with your hydration intake in cold weather and while swimming by bringing a water bottle with you (or a sport drink when appropriate). Caffeine causes dehydration. MYTH Athletes have been cautioned to avoid caffeine (ex. coffee) before and after exercise due to association with dehydration or e...
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