Substrate metabolism during different exercise intensities in endurance-trained women

• DOI: 10.1152/jappl.2000.88.5.1707
• Publication Date: 2017-12-23T00:45:55Z
• Authors: J. A. Romijn; E. F. Coyle; L. S. Sidossis; J. Rosenblatt; R. R. Wolfe
• Keywords: Exercise intensity; Intensity; Carbohydrate Metabolism; Physical exercise; Endurance Training; Exercise physiology

We have studied eight endurance-trained women at rest and during exercise 25, 65, 85% of maximal oxygen uptake. The rate appearance (R a ) free fatty acids (FFA) was determined by infusion [ 2 H ]palmitate, fat oxidation rates were indirect calorimetry. Glucose kinetics assessed with [6,6- ]glucose. R increased in relation to intensity. In contrast, whereas FFA significantly the same extent low- moderate-intensity exercise, high-intensity reduced compared other values. Carbohydrate progressively intensity, highest 65% After correction for differences lean body mass, there no between these results previously reported data men under conditions, except slight glucose metabolism low-intensity (Romijn JA, Coyle EF, Sidossis LS, Gastaldelli A, Horowitz JF, Endert E, Wolfe RR. Am J Physiol Endocrinol Metab 265: E380–E391, 1993). conclude that patterns changes substrate moderate- are similar trained women.