http://www.nytimes.com/2016/09/06/science/temperature-heat-tolerance.html 2016-09-05 16:47:41 The Mystery of Sweating Buckets The overlapping factors that affect an individual’s heat tolerance are many, ranging from age and body mass to circulatory efficiency and hydration. === Q. A 90-degree day means I sweat buckets just walking the dog and lose every bit of energy. Why do some people tolerate the heat less well than others? A. Then there are medical conditions that can reduce heat tolerance, such as menopause, autoimmune diseases, multiple sclerosis, thyroid trouble and cancer of the pituitary gland, not to mention some drugs used to treat diseases. Anxiety is often a factor, as is the overuse of common substances like caffeine. On top of all these variables, studies have found that tolerance cannot be considered without Studies done for NASA and the military have found that systematic and gradual exposure to activity at high heat