Electronic Thesis and Dissertation Repository


Master of Science




Glen Belfry


Purpose: The purpose of this study was to compare and contrast the effects of a long duration exercise cycle (~3 h) by trained cyclists (RIDE) to a 3 h inactive period (SED) in recreationally active individuals (CONT) on VO2, VCO2, peak aerobic power, fat oxidation, anaerobic capacity (Wʹ), arterialised-capillary lactate concentration and maximal sustainable power (CP). Methods: Male cyclists (n=12) and male recreationally active individuals (n=7) performed both an incremental test to volitional fatigue (RAMP) and 3 min all-out tests on a cycle ergometer, pre- and post-RIDE/SED respectively. Results: Increased fat oxidation rates, and reductions in VO2peak, peak aerobic power anaerobic capacity (Wʹ) and no changes in CP pre- to post-RIDE. No changes in CONT pre- to post-SED were observed. Summary: The decreased Wʹ, and arterialised-capillary lactate concentrations post-RIDE, after both RAMP and 3 min all-out tests suggests diminished substrate level phosphorylation associated with the depleted glycogen stores. Critical power was affected by this RIDE.