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why do we sweat more when we exercise

Why do we sweat? The purpose of sweat is to cool the body by sitting on the surface of the skin and allowing heat to escape from the body. Effective sweating is when someone is glistening as the moisture forms a cooling film over the skin. When sweat reaches the 'dripping' stage the body is struggling to effectively control the body temperature and will be less effective at cooling the body down. Whether someone glistens or drips, however, is not indicative of how hard they are working, it merely indicates how effectively they sweat. Factors such as the humidity and temperature of the environment you are working in and the clothing worn also have a significant effect on sweat production.

Sweating during workouts Work rate and sweating do not correlate together accurately, especially if you are getting back into exercise after a long period of inactivity. If you are starting aerobic exercise again after time away then you can sweat even if you aren't working particularly hard because it takes time for your sweating mechanisms to adapt to the workout. As you exercise aerobically for a consistent period of time, you will start to sweat 'better' and will not drip as much at the same intensity of exercise.

As well as this, the sweat becomes more dilute as you improve your sweating system. The Borg Scale Instead of taking sweating as an indicator of your exercise intensity levels, try using the Borg scale to measure your intensity levels. It gives a much more subjective indicator of effort because the feeling of fatigue is very highly correlated with heart rate. As you exercise, rate yourself between 6 and 20. If you can work hard enough to rate yourself between 12 and16 then you would be achieving the heart rate zone of 65-75% of your maximum heart rate:
BORG SCALE: 6, 7 - very, very light exertion 8, 9 - very light exertion 10, 11 - fairly light exertion 12, 13 - fairly hard exertion 14, 15 - hard exertion 16, 17 - very hard exertion 18, 19, 20 - very, very hard exertion Using such a scale would allow you to rate what intensity you are working at so you are aware of your training level.

Remember that there are many extremely fit individuals sweat A LOT, regardless of exercise intensity or duration. This relates to their glands rather than their fitness, and is another reason why sweating proves to be an inaccurate measure of work rate. Great question!

Our body needs a way of regulating it s core temperature to keep it as close to our normal set point (37C) as possible. When we exercise the increases in metabolism and muscle activity generate heat. Our bodies need a way to get rid of some of this excess heat. Sweating is a really good way to do this as the evaporation of sweat accelerates heat loss (think about when you get out of an outdoor swimming pool and your feel cool as the wind helps to dry you off). So we sweat to help us to cool down during exercise and when it is really hot outside we sweat a lot more than we would in the cold.

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