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by HowStuffWorks
Lack of good research on cramps has caused a lot of myths. Let's start with the facts.
Muscle cramps are very common during (and more commonly after) exercise. Several theories try to explain why cramps happen, including low blood sugar, dehydration, salt imbalances caused by sweating and either extreme heat or extreme cold. All these can cause cramping by themselves, but it is not clear if any ...