Just because it’s cooler outside doesn’t mean your body doesn’t need to be hydrated. The body’s thirst response is reduced by up to 40% in the winter. When you get cold your blood vessels constrict slowing the blood flow to your extremities which is why your hands and feet typically get cold first.
In the winter we don’t always feel sweaty, but that doesn’t mean you’re not sweating. It means your clothing is doing its job. Winters in Utah are very dry, more try than the summers actually, because the water in the air is frozen. I have to put lotion on a few times throughout the day and my hair frizzes nearly every day. This dry frozen air can increase your chances of becoming dehydrated, so don’t neglect this critical aspect of your winter training.
Another contributing factor for winter dehydration is losing water through your lungs. The colder the air the more water vapor is present in your breath. You can see it when you exhale. It freezes and you can’t breath it back in.
The first step in maintaining your hydration is developing the habit of taking sips throughout your runs. Frequent small sips of water is easier on your body and reduces the risk of becoming dehydrated. If you wait until you want to guzzle the water, you have waited too long and are now trying to play catch-up, which is never a good place to be in.
Next is your clothing. Maintaining a comfortable body temperature allows you to have more stable water and electrolyte loss. Wear layers you can take off and put back on as needed.
Be aware of how much you are drinking. This is huge because many of us get in our zone and we don’t really pay attention to how much we are sweating or when the last time was we sipped on our water or how frequently we are doing so.
Winter hydrating can be a challenge if you run outside in temperatures below freezing. There are insulated handhelds and hydration packs (snowboarders and skiers use them). You may need to break up your run to keep your water from freezing or get a really nice friend who is willing to bring you water every so often.
If you are using a hydration pack and it’s not insulated make sure and blow the water out of the tube and mouth piece every time you take a sip. If you leave it in the tube, it will freeze leaving you with nothing to drink.