Date of Award


Degree Type


Degree Name

Master of Science




Don Paterson

Second Advisor

John Kowalchuk


The effects of prior heavy-intensity exercise (HI) on VO2 kinetics were examined during subsequent heavy-intensity exercise (H2) in upright cycle (CE) and alternate-leg kneeextension (KE) ergometιy in 9 subjects. VO2 was measured breath-by-breath. Oxygenated (O2Hb), deoxygenated (HHb) and total (Hbtot) haemoglobin/myoglobin of the vastus lateralis were monitored by near-infrared spectroscopy. Prior exercise had no significant effect on the primary time constant (τp VO2 ) in either mode, but increased the amplitude and/or asymptotic primary VO2 with A[O2Hb], A[Hbtot] and primary Δ[HHb] amplitudes greater (P < 0.05) in H2 versus Hl in both modalities. Priming resulted in both a reduced (P < 0.05) slow component Vo2 amplitude and muscle deoxygenation in CE and KE. These results suggest increased muscle O2 availability and O2 extraction increased the primary VO2 response but did not affect the τpVθ2, and heavy priming attenuated the VO2 slow component amplitude with enhanced O2 availability and decreased muscle deoxygenation in both modes.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.