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A water tale for all seasons: When it comes to hydration and exercise, the system works A US Army lab found dehydration has a minimal effect in the cold, but cuts performance by 8% in temperate weather. It`s the difference between a 2 hour-30 minute and a 2:42 marathon. Plus, five “common sense” tips on hydration, exercise and weather.Dehydration has minimal effect in cold, but cuts performance by 8% as temperature rises; the difference between a 2:30 and a 2:42 marathon.
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