Oxygen Uptake Kinetics in Severe Intensity Exercise

• Main Author: Blumoff, Sonja
• Other Authors: Hill, David W.
• Format: Others
• Language: English
• Published: University of North Texas 2000
• Subjects: Oxygen in the body > Measurement.; Exercise tests.; Fatigue.; oxygen uptake; fatigue; exercise research
• Online Access: https://digital.library.unt.edu/ark:/67531/metadc2539/

The purpose of this study was to describe mathematically the oxygen uptake kinetics during cycle ergometry, and to examine the effect of intensity on the kinetic responses within the severe domain. Sixteen volunteers performed a series of exercise tests at a range of intensities selected to elicit fatigue in ~3 to 10 min. A simple mono-exponential model effectively described the response across all intensities. There was a positive correlation between the response time and the time to fatigue, demonstrating that the maximal oxygen uptake was achieved faster at higher intensities within the severe domain. Models incorporating two components effectively described the responses only in tests lasting 8 min or more. It was concluded that there is a second, slow component in the oxygen uptake response only at the lower intensities within the severe domain.