Date of Award


Degree Type


Degree Name

Master of Science




Dr. John M. Kowalchuk


The purpose of this study was to investigate the effects high-intensity interval training (HIT) on V02p kinetics during transitions from low and elevated metabolic rates, within the moderate-intensity (MOD) domain. Eight untrained males completed 12 sessions of HIT, consisting of 8-12 intervals cycling at 110% maximal O2 uptake (V02P) on a cycle ergometer. Ramp incremental, performance, and double-step constant-load tests were completed at 4 time points throughout training. HIT led to increases in V02max fP<0.05) and performance (PO.Ol). Additionally, tV02P of both lower and upper MOD step transitions were reduced by -40% (LS: 24s—►15s; US: 45s—►25s) (PO.Ol). The time course of muscle deoxygenation was not changed with HIT, suggesting improved matching of microvascular O2 delivery with muscle O2 utilization. These results are the first to demonstrate speeding of both lower and upper step MOD V0 2 P kinetics following an effective HIT program, with significant simultaneous improvements in both performance and V0 2 max.



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