Electronic Thesis and Dissertation Repository


Master of Science




Dr. Glen Belfry


The purpose of this study was to investigate the kinetic response of oxygen uptake (V̇O2)and muscle deoxygenation (HHb) in males (24 yr±3, n = 10) to identical heavy intensity continuous (CONT), and intermittent work; 25 s (25 s work: 3 s recovery (20W)), and 10 s (10 s work: 3 s recovery (20W)), were compared. The τV̇O2 were similar in all conditions (CONT: 44.2 s±9; 25 s: 38.9 s±10; 10 s: 39.4 s±8, p > 0.05), whereas the HHb/ V̇O2 overshoot decreased across conditions (p < 0.05). The increased frequency of recovery periods slowed V̇O2p kinetics suggesting increased activity of the creatine kinase enzyme and increased ATP-PCr contribution, while reducing glycolytic and oxidative phosphorylation contributions to perform the identical work rate. Enhanced microvascular blood flow facilitated an accelerated matching of total O2 delivery to O2 utilization as well with increased recovery periods.