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ROLE OF FATS IN EXERCISE

1999; Elsevier BV; Volume: 18; Issue: 3 Linguagem: Inglês

10.1016/s0278-5919(05)70163-0

1556-228X

Lorraine P. Turcotte,

Diet and metabolism studies

Lipid fuel sources are important energy substrates for skeletal muscle metabolism during endurance exercise, especially prolonged exercise of low to moderate intensity. Their contribution to total oxidative metabolism is dependent on a variety of factors, including exercise intensity and duration, training, and dietary status. Oxidizable lipid fuels include circulating plasma triacylglycerols (TG), free fatty acids (FFAs), and muscle TG. Although circulating albumin-bound FFAs mobilized from adipose tissue contribute in significant proportion to lipid metabolism in skeletal muscle during exercise, the conditions during which FFA hydrolyzed from muscle and plasma TG contribute to lipid metabolism during exercise are less clearly defined. This article examines the contribution made by each of these lipid fuel sources to skeletal muscle metabolism during exercise and the regulatory mechanisms that control variations in their contributions. The impact of dietary manipulations on the rate of lipid use is described in the last section of this article.