Document Detail


Optimizing the "priming" effect: influence of prior exercise intensity and recovery duration on O2 uptake kinetics and severe-intensity exercise tolerance.
MedLine Citation:
PMID:  19797685     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
It has been suggested that a prior bout of high-intensity exercise has the potential to enhance performance during subsequent high-intensity exercise by accelerating the O(2) uptake (Vo(2)) on-response. However, the optimal combination of prior exercise intensity and subsequent recovery duration required to elicit this effect is presently unclear. Eight male participants, aged 18-24 yr, completed step cycle ergometer exercise tests to 80% of the difference between the preestablished gas exchange threshold and maximal Vo(2) (i.e., 80%Delta) after no prior exercise (control) and after six different combinations of prior exercise intensity and recovery duration: 40%Delta with 3 min (40-3-80), 9 min (40-9-80), and 20 min (40-20-80) of recovery and 70%Delta with 3 min (70-3-80), 9 min (70-9-80), and 20 min (70-20-80) of recovery. Overall Vo(2) kinetics were accelerated relative to control in all conditions except for 40-9-80 and 40-20-80 conditions as a consequence of a reduction in the Vo(2) slow component amplitude; the phase II time constant was not significantly altered with any prior exercise/recovery combination. Exercise tolerance at 80%Delta was improved by 15% and 30% above control in the 70-9-80 and 70-20-80 conditions, respectively, but was impaired by 16% in the 70-3-80 condition. Prior exercise at 40%Delta did not significantly influence exercise tolerance regardless of the recovery duration. These data demonstrate that prior high-intensity exercise ( approximately 70%Delta) can enhance the tolerance to subsequent high-intensity exercise provided that it is coupled with adequate recovery duration (>or=9 min). This combination presumably optimizes the balance between preserving the effects of prior exercise on Vo(2) kinetics and providing sufficient time for muscle homeostasis (e.g., muscle phosphocreatine and H(+) concentrations) to be restored.
Authors:
Stephen J Bailey; Anni Vanhatalo; Daryl P Wilkerson; Fred J Dimenna; Andrew M Jones
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Publication Detail:
Type:  Journal Article     Date:  2009-10-01
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  107     ISSN:  1522-1601     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2009-12-02     Completed Date:  2010-02-02     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1743-56     Citation Subset:  IM    
Affiliation:
School of Sport and Health Sciences, St Luke's Campus, University of Exeter, Devon, UK.
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Analysis of Variance
Athletic Performance / physiology*
Electromyography
Exercise / physiology*
Exercise Test
Exercise Tolerance
Heart Rate / physiology
Humans
Lactic Acid / blood
Male
Models, Biological
Muscle Contraction / physiology
Muscle, Skeletal / physiology
Oxygen Consumption / physiology*
Spectroscopy, Near-Infrared
Time Factors
Young Adult
Chemical
Reg. No./Substance:
50-21-5/Lactic Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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