February 10, 2008
Can Sweating Too Much During Exercise Be Dangerous To Your Health?
Are you under the impression that by sweating while working out you will loose weight? Do you see people at your gym or out jogging who wear rubber suits or extra sweatshirts during the hot summer months, just to loose a few extra pounds? Well allow us to correct that myth.
The basic rule of working out is to avoid dripping sweat whenever possible. It takes energy to lose heat. This energy comes from the activity of your sweat glands; millions of them lying just under your skin use metabolic energy to secrete sweat. This energy is drained from the total energy you have at your command to do the work of your body. Your muscles have to share in this energy in order to function properly. If a disproportionate share of that energy is used to secrete sweat, then there isn't enough left for your other bodily functions. The amount of work you can do lessens when sweat glands use energy. When exhausted, they stop secreting, and you're in peril of a heat stroke.
The second loss of energy when you overheat is in your cardiovascular system. When the skin gets hot, the peripheral vessels leading to the skin open. The big part of your blood supply rushes to the surface of your body. This deprives the muscles of the blood they need. The heart tries to make up for the loss by pumping harder. The load becomes so great that if it's maintained for a prolonged period you could collapse, and conceivably die. Inducing sweat is dangerous - and it makes no contribution to fitness.
The best clothing for hot-weather exercise is naked skin. If you're exercising indoors, a pair of shorts is just fine. If you're working in the garden, jogging, or playing tennis or golf, your clothing should be lightweight and light in color. The difference between a dark shirt and a light shirt can mean the difference between comfort and discomfort.
There is no danger in being comfortably cool while you're working hard. It's an absolute disadvantage to be uncomfortably warm. It's even disadvantageous when sleeping. Not long ago, the mother of a friend of mine was sliding downhill fast for no apparent reason. She was active. Her diet was okay. She'd been to the doctor; he'd found nothing wrong with her. So I asked her if, by chance, she was using an electric blanket. Yes, she said, as a matter of fact, she'd just received one for Christmas. So I asked her to check the setting. It turned out that she had been using the blanket like an electric heating pad, and had been bathed in sweat all night. I advised her to turn the blanket down to a low setting that took the chill off the bed but didn't overheat her. Her energy bounded back immediately.
Sweating does make the heart work harder, which is an objective of a fitness workout, but it does so in a hazardous manner. In exercise, you can control the pumping of your heart simply by stopping what you're doing. But when you overload your heart by overheating your body, there's no way you can stop the process except by jumping into some ice water.
Sweating does burn calories, but it's a dangerous way to reduce. You could have the best figure in the morgue. That's a remote possibility, but why take a chance? The basic point to remember is this: You have only so much energy available. It takes a lot of energy to lose heat. If you use your energy this way, you won't have the energy you need to accomplish the task that's making you hot. Off with the sweat suits! Away with rubberized garments!