James Brown examined the role of irisin. Irisin is a naturally occurring hormone that is present in the body after bouts of exercise. The hormone is in charge of getting the body’s fat cells to burn energy as opposed to storing it. When the fat cells burn energy, the body’s metabolic rate increases, which have been tied to having anti-obesity effects. 44 of them were males and 37 were females. The ages ranged from 18 to 83 and the participants had a body mass index (BMI) between 20 and 30, which meant that none of them were fitness obese. The researchers only recruited participants that did not have type 2 diabetes, a history of cancer, an immune disorder or were recently hospitalized and treated with oral corticosteroids. The researchers controlled exercise levels by instructing all participants to refrain from any forms of exercise for at least 12 hours before the study started.
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