NDLI: Influence of priming exercise on pulmonary O2 uptake kinetics during transitions to high-intensity exercise at extreme pedal rates.

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Influence of priming exercise on pulmonary O2 uptake kinetics during transitions to high-intensity exercise at extreme pedal rates.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	DiMenna, Fred J. Wilkerson, Daryl P. Burnley, Mark Bailey, Stephen J. Jones, Andrew M.
Description	Author Affiliation: DiMenna FJ ( University of Exeter, Exeter, Devon, EX1 2LU UK.)
Abstract	We investigated the pedal rate dependency of the effect of priming exercise on pulmonary oxygen uptake (Vo(2)) kinetics. Seven healthy men completed two, 6-min bouts of high-intensity cycle exercise (separated by 6 min of rest) using different combinations of extreme pedal rates for the priming and criterion exercise bouts (i.e., 35-->35, 35-->115, 115-->35, and 115-->115 rev/min). Pulmonary gas exchange and heart rate were measured breath-by-breath, and muscle oxygenation was assessed using near-infrared spectroscopy. When the priming bout was performed at 35 rev/min (35-->35 and 35-->115 conditions), the phase II Vo(2) time constant (tau) was not significantly altered (bout 1: 31 +/- 7 vs. bout 2: 30 +/- 5 s and bout 1: 48 +/- 16 vs. bout 2: 46 +/- 21 s, respectively). However, when the priming bout was performed at 115 rev/min (115-->35 and 115-->115 conditions), the phase II tau was significantly reduced (bout 1: 31 +/- 7 vs. bout 2: 26 +/- 5 s and bout 1: 48 +/- 16 vs. bout 2: 39 +/- 9 s, respectively, P < 0.05). Muscle oxygenation was significantly higher after priming exercise in all four conditions, but significant effects on Vo(2) kinetics were only evident when muscle O(2) extraction (measured as Delta[deoxyhemoglobin]/DeltaVo(2)) was elevated in the fundamental response phase. These data indicate that prior high-intensity exercise at a high pedal rate can speed Vo(2) kinetics during subsequent high-intensity exercise, presumably through specific priming effects on type II muscle fibers.
File Format	HTM / HTML
ISSN	87507587
e-ISSN	15221601
Journal	Journal of Applied Physiology
Issue Number	2
Volume Number	106
Language	English
Publisher	American Physiological Society
Publisher Date	2009-02-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Physiology Muscle Contraction Muscle, Skeletal Metabolism Oxygen Consumption Oxygen Pulmonary Ventilation Bicycling Heart Rate Hemoglobins Kinetics Muscle Fibers, Fast-twitch Spectrophotometry, Infrared Comparative Study
Content Type	Text
Resource Type	Article
Subject	Physiology Physiology (medical) Sports Science

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