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Please see our copyright and disclaimer notice page. In other words, skiers need to make a conscious effort to maintain hydration. Dehydration, which occurs whenever fluid is lost from the body faster than it can be ingested, is probably the most common cause of premature fatigue during a long day of skiing. Even small degrees of dehydration can impair physiological function and hinder skiing performance. Moreover, dehydration can contribute to accidents, injuries, hypothermia, frostbite and acute mountain sickness.