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J Appl Physiol 95: 113-120, 2003. First published April 4, 2003; doi:10.1152/japplphysiol.00956.2002
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Relationship between pulmonary O2 uptake kinetics and muscle deoxygenation during moderate-intensity exercise

Darren S. DeLorey,1,2 John M. Kowalchuk,1,2,3 and Donald H. Paterson1,2

1Canadian Centre for Activity and Aging, 2School of Kinesiology, and 3Department of Physiology and Pharmacology, The University of Western Ontario, London, Ontario, Canada N6A 3K7

Submitted 15 October 2002 ; accepted in final form 27 March 2003

The temporal relationship between the kinetics of phase 2 pulmonary O2 uptake (O2p) and deoxygenation of the vastus lateralis muscle was examined during moderate-intensity leg-cycling exercise. Young adults (5 men, 6 women; 23 ± 3 yr; mean ± SD) performed repeated transitions on 3 separate days from 20 W to a constant work rate corresponding to 80% of lactate threshold. Breath-by-breath O2p was measured by mass spectrometer and volume turbine. Deoxyhemoglobin (HHb), oxyhemoglobin, and total hemoglobin and myoglobin were sampled each second by near-infrared spectroscopy (Hamamatsu NIRO-300). O2p data were filtered, interpolated to 1 s, and averaged to 5-s bins; HHb data were averaged to 5-s bins. Phase 2 O2p data were fit with a monoexponential model. For HHb, a time delay (TDHHb) from exercise onset to an increase in HHb was determined, and thereafter data were fit with a monoexponential model. The time constant for O2p (30 ± 8 s) was slower (P < 0.01) than that for HHb (10 ± 3 s). The TDHHb before an increase in HHb was 13 ± 2 s. The possible mechanisms of the TDHHb are discussed with reference to metabolic activation and matching of local muscle O2 delivery and O2 utilization. After this initial TDHHb, the kinetics of local muscle deoxygenation were faster than those of phase 2 O2p (and presumably muscle O2 consumption), reflecting increased O2 extraction and a mismatch between local muscle O2 consumption and perfusion.

near-infrared spectroscopy; muscle oxygen utilization


Address for reprint requests and other correspondence: D. H. Paterson, Canadian Centre for Activity and Aging, School of Kinesiology, The Univ. of Western Ontario, London, Ontario, Canada N6A 3K7 (E-mail: dpaterso{at}uwo.ca).




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