A recent study published in the journal Nutrition showed that vitamin C intake may decrease heart rate during exercise and reduce the perception of fatigue and exertion. This study was performed at Arizona State University and involved 20 obese adults (BMI of 34.3 kg/m2) with an average age of 35. The participants were given a calorie-controlled diet for four weeks with or without a daily vitamin C supplement of 500 mg. They were tested before and after the study doing 60 minutes of exercise at an intensity of 50% of predicted maximal oxygen consumption. Those taking 500 mg vitamin C daily had a reduced heart rate and reduced perceived exertion by about 10%. It is difficult to know what to make of these results. Do they apply to normal weight fit individuals? It certainly points out that in this population vitamin C may make exercise more enjoyable and certainly won't hurt.
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