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. 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). Seven of the men were taking the carbohydrate drink before exercising, whilst six were taking it afterwards. No one knew who was taking which drink when. 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. 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. ![]() "Most people exercise for health, not performance.”ĭr Collins’s original research suggests that untrained females may benefit from consuming food prior to exercise and avoid eating during recovery, whereas untrained males may benefit from waiting until recovery to consume food. Hence the strategies for eating and exercise are different for competitive athletes. ![]() Dr Adam Collins, Programme Director for BSc and MSc Nutrition at the University of Surrey, has discovered that the amount of fat we burn changes based on whether we eat before or after exercise – and this is also different for men and women.ĭr Collins said: “Most people are using exercise to get healthier, lose weight, or burn fat rather than maximise performance like athletes do.
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