ABSTRACT
I. Introduction................................................................................. 283 II. Protein Turnover ......................................................................... 285
A. Protein Turnover and Endurance Exercise .......................... 286 B. Skeletal Muscle Protein Metabolism and
Protein Turnover ................................................................... 286 C. Splanchnic Tissue Protein Turnover .................................... 288
III. Protein Turnover and Resistance Exercise ................................ 289 IV. Protein Requirements ................................................................. 292
A. Habitual Protein Intakes ....................................................... 292 B. Protein Requirements for
Endurance-Trained Athletes ................................................. 294 C. Protein Requirements for
Resistance-Trained Athletes.................................................. 299 V. Future Directions ........................................................................ 305
VI. Summary...................................................................................... 306 References ............................................................................................. 308
During aerobic exercise, the main substrates oxidized are carbohydrate (CHO) and, to a lesser degree, fat. The oxidation of these fuels follows an inverse relationship, with the contribution of CHO to energy cost of exercise becoming greater at high exercise intensities and the contribution of fat greater at lower intensities.
