In order to see whether this effect measured in the laboratory could be significant in the real world, BBC2s Trust Me I’m a Doctor teamed up with Dr Collins and his research group to recruit 30 volunteers to take part in another experiment. Thirteen men and 17 women were selected who did not normally do a lot of exercise, and for four weeks they all took part in three supervised classes a week: high intensity training, Zumba and spin classes.Īll of them had a drink both before and after each exercise class, but one of their drinks was a placebo (had no calories in it), whilst the other was a carefully calorie-controlled hit of carbohydrates. No one knew who was taking which drink when. Seven of the men were taking the carbohydrate drink before exercising, whilst six were taking it afterwards. Seven of the women were taking the carbohydrate drink before exercising, whilst ten were taking it afterwards.Īt the beginning and end of the experiment, researchers tested how much fat they were burning while at rest (as well as a range of other measures such as weight, waist circumference and blood sugar/fat levels). While all the women ended up burning slightly more fat at the end of the experiment, those who were consuming carbohydrates before their exercise were burning more.
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