our calorie expenditure is generally based on your body weight, workout intensity and duration of physical activity. However, exposing your body to hot temperatures during exercise does affect its calorie expenditure because of your body’s need to cool itself, according to the American Council on Exercise. However, if you’re going to work out in extreme heat, beware of dehydration and other heat-related illnesses, according to authors of a 2011 review in the “Journal of Athletic Training.”
Hot vs. Cold Temperatures
According to the American Council on Exercise, you will indeed burn more calories in extreme heat than in moderate, more comfortable conditions. This is because your body expends additional energy trying to cool itself by pumping blood to your skin and sweating. On the flip side, working out in extreme cold temperatures -- which can cause your body to shiver -- may burn even more calories than sweating in extreme heat. This is because shivering is your body's way of expending energy to regulate your body temperature. ACE reports that shivering alone can burn 400 calories per hour.