Thursday, January 18, 2007

The myth about sweat

I wanted to post this in Seribadan but nothing happened after I clicked the 'publish' button. So I publish it here in the meantime....

What’s the Sweat?
MYTH ONE : If you’re not sweating, you’re not working out.

There are a lot of misconceptions about sweat. Hear this fact: Sweat has only one purpose — to cool the body. When your body temperature rises as a result of the energy production required by exercise (or the heat of the day), a couple of responses are triggered. First, the heart beats faster to move blood around the organs more quickly to absorb heat. At the same time, capillaries just under the skin dilate so blood can be closer to the skin surface, which is usually cooler than body temperature. If these cooling mechanisms aren’t enough, your sweating reflex kicks in — something like a built-in shower. Water from the blood moves to the skin surface through a network of more than 2.5 million ducts, or sweat glands, in the skin. When this “sweat” — which is composed of 99% water and 1% salt and other protein and fat-based metabolites — evaporates, it cools the body and leaves a salty-tasting residue on your skin.
You’ll notice the sweat if you live in a humid climate that deters evaporation. You may never think you sweat in a dry climate, where the same workout, at the same temperature, produces the same amount of sweat, but is not noticed because it evaporates so quickly.
Although sweat has no odor itself, when it is combined with bacteria on the body, it’s time to roll out the deodorant to combat the unpleasant odor associated with sweat.
MYTH TWO : Sweating helps you lose fat.
Some people still come to the gym wearing sweater suits designed to make them sweat profusely. If asked why they are using this gear, they often respond, “To sweat off fat.” Had they said, “To lose weight,” they would be accurate but misguided. Any post-workout decrease in weight is water-based sweat, not fat. Fluid replacement returns the scale to a pre-workout reading. The danger in this thermal approach to weight management is that any sweat produced cannot evaporate and cool the body.

MYTH THREE : Sweating rids the body of toxins.
There are no toxins in sweat. Toxins are removed by a healthy kidney and liver working full time to counter all we do to abuse our bodies with poor exercise, eating, and lifestyle habits. The body isn’t detoxified when it sweats. It’s overheated.
Sweating dehydrates the body. A dehydrated body is prone to heat exhaustion and heat stroke. Lost fluid must be replaced. Drinking water is a good place to start. A cup of water before and after your workout and sipping your water during exercise will suffice..
Source : www.walkabout.com

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