Role of Lipids on Endurance Capacity in Man

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Abstract
A man whose weight is near 70 kg has approximately 15 kg of fat as triglycerides in adipose tissue, representing about 140,000 kcal. With such a quantity of stored fat, the question is to know why triglycerides are not the only fuel for exercise. Probably because this fuel cannot sustain maximal rates of exercise. The ability to sustain maximal exercise is dependent on carbohydrate use. The reason for the limited rate at which energy can be derived from fat store is not clear. We can examine successively: Enhanced lipid availability resulting from eating a fatty meal before exercise, or a chronic high fat diet, or fasting, is not capable of enhancing endurance capacity in humans. The glucose-fatty acid cycle which has previously been proposed to spare muscle glycogen stores is not operative in man.

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