You’re probably aware that when you work out, you sweat. But do you know why?
When you work out, your heart rate rises, causing a bump in your body temperature. That temperature increase causes your brain to send neurological signals to your sweat glands, telling them to get to work.
Your body produces sweat. The process of sweat evaporating off the skin removes heat from the skin, which in turn helps cool the rest of the body (remember, your skin is the body’s largest organ!) The more your internal body temperature increases, the more you sweat. Your body needs to pull that fluid from somewhere – and some of it comes from the fluids surrounding your cells, which negatively effects cell function.
The increase in core body temperature comes more quickly and becomes more extreme on a very hot or humid day. Additionally, humidity stifles the sweat evaporation process, throwing a wrench into the wheels of your body’s climate control. And remember, you still sweat when it’s cold out. While you might not sweat as much, you still need to make sure you’re hydrated.
Think of your body as a huge tank full of water. Ideally, you’d start each workout with this tank as full as it can possibly be (i.e. ‘well-hydrated’) and replenish the tank as it empties (as you sweat).
HOW DO I KNOW IF I’M DEHYDRATED?
It seems a little gross, but the easiest way to gauge whether you’re properly hydrated or not is when you’re in the bathroom…and don’t wait until you’re thirsty to start sipping! Try and sip water all day to maintain proper hydration. There are also some great electrolyte drinks that can not only jazz up your water but also replace electrolytes and nutrients lost when you sweat. Check out Nuun Hydration products, which are available in Marathon Sports stores.