Does Sweating More Mean You’re More Fit?

Sweat is one of your body’s primary means of preventing your core temperature from rising to dangerous levels. During exercise, the majority of the calories you burn actually generate heat instead of powering forward motion (sorry, but that’s just the way it is). In fact, on the bike you are only about 20-25% efficient, meaning 75% of the energy you produce becomes heat. That heat has to be dissipated, so your body dilates blood vessels near the skin to carry some of that heat away from your core to areas where cooler air flowing over the skin can carry away some of the heat. Sweat makes the cooling process work even better, because as sweat evaporates off your skin it takes a lot of heat with it. You need to worry when you feel to stop sweat while sweating excessively.

As you become more fit, you are able to work harder. You generate more power on the bike and maintain a faster pace on the run and in the water. But the ability to work harder also means you have the ability to generate a lot of heat in a very short period of time. You also have the endurance to sustain exercise longer, meaning you have the capacity to generate heat for a longer period of time. Your body has to adapt to these demands in order to keep your core temperature stable. Here are a couple of ways it does that:

You start sweating sooner: Your body’s sweat response gets quicker as you gain fitness. This means you’ll see sweat appearing on your skin sooner after you start exercising than you did when you were a novice. These days, when you start warming up your body knows what’s coming next, so it ramps up the cooling process more quickly to stay ahead of the rise in core temperature.
Your sweat volume increases: When the house is on fire, you open up the spigots and get as much water on it as you can. For the fire within, we don’t want to extinguish it but we need to control it, and the more sweat you get onto your skin the more likely you are to be able to keep core temperature from rising out of control. So your body becomes better at creating sweat.
You lose fewer electrolytes per unit volume: As your body is adapting to sweat more and sooner, it also changes the composition of sweat so that you retain more electrolytes than you used to. You’ll still need to replenish electrolytes during exercise, but this adaptation helps to keep the electrolyte requirement manageable.

Read more – Reasons of Excessive Sweating

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