The Effects of Short Work Versus Longer Work Periods Within Intermittent Exercise on VO2 Kinetics, Muscle Deoxygenation and Energy System Contribution

Author

Michael C. McCrudden, The University of Western OntarioFollow

Degree

Master of Science

Program

Kinesiology

Supervisor

Dr. Glen Belfry

Abstract

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 V̇O_2p 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.

Recommended Citation

McCrudden, Michael C., "The Effects of Short Work Versus Longer Work Periods Within Intermittent Exercise on VO2 Kinetics, Muscle Deoxygenation and Energy System Contribution" (2015). Electronic Thesis and Dissertation Repository. 3026.
https://ir.lib.uwo.ca/etd/3026