Date of Award
2008
Degree Type
Thesis
Degree Name
Master of Science
Program
Kinesiology
Supervisor
Don Paterson
Second Advisor
John Kowalchuk
Abstract
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.
Recommended Citation
Cleland, Sarah M., "OXYGEN UPTAKE KINETICS DURING HEAVY CYCLING VERSUS KNEE-EXTENSION EXERCISE AND EFFECT OF PRIOR HEAVY EXERCISE" (2008). Digitized Theses. 4833.
https://ir.lib.uwo.ca/digitizedtheses/4833