With this warm weather it is sometimes difficult to consider whether or not you should go for a run. One person loves running in the sun, while the other does not have to think about exercising in the sun. But is it true that you burn more calories when you run or exercise in hot weather? We have the answer!
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The answer — irritatingly enough — is "maybe." It depends on several factors whether you burn more. One is your BSR, or basal metabolic rate. This stands for the amount of energy we expend per unit of time at rest, also known as how fast we burn calories to keep our cells moving. This speed can vary based on your activity level, but can also be influenced by weather and climate.
Warm weather can cause your basal metabolic rate to increase slightly, so that you burn your calories a little faster. At that moment, your body has to work harder to keep you cool. However, there are no scientific studies that have proven exactly how many more calories you would burn. Also, burning more calories in warm weather can decrease over time as your body learns to adapt to its circumstances. So someone who is not used to exercising in warm weather will probably burn more calories in the beginning than someone who regularly exercises in warm weather. Your body will adapt so that it has to work less hard in such temperatures and so the amount of calories you burn will gradually decrease. Although you probably feel more satisfied after a workout in warm weather, it is actually wise not to exercise when it is so bizarrely hot, because then you can often last longer and you will see effects faster.
Source: Livestrong.com