Document Detail


Effect of recovery duration from prior exhaustive exercise on the parameters of the power-duration relationship.
MedLine Citation:
PMID:  20093659     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The physiological equivalents of the curvature constant (W') of the high-intensity power-duration (P-t(LIM)) relationship are poorly understood, although they are presumed to reach maxima/minima at exhaustion. In an attempt to improve our understanding of the determinants of W', we therefore aimed to determine its recovery kinetics following exhaustive exercise (which depletes W') concomitantly with those of O(2) uptake (V(O(2)), a proxy for the kinetics of phosphocreatine replenishment) and blood lactate concentration ([L(-)]). Six men performed cycle-ergometer exercise to t(LIM): a ramp and four constant-load tests, at different work rates, for estimation of lactate threshold, W', critical power (CP), and maximum V(O(2)). Three further exhausting tests were performed at different work rates, each preceded by an exhausting "conditioning" bout, with intervening recoveries of 2, 6, and 15 min. Neither prior exhaustion nor recovery duration altered V(O(2)) or [L(-)] at t(LIM). Postconditioning, the P-t(LIM) relationship remained well characterized by a hyperbola, with CP unchanged. However, W' recovered to 37 +/- 5, 65 +/- 6, and 86 +/- 4% of control following 2, 6, and 15 min of intervening recovery, respectively. The W' recovery was curvilinear [interpolated half time (t(1/2)) = 234 +/- 32 s] and appreciably slower than V(O(2)) recovery (t(1/2) = 74 +/- 2 s) but faster than [L(-)] recovery (t(1/2) = 1,366 +/- 799 s). This suggests that W' determines supra-CP exercise tolerance, its restitution kinetics are not a unique function of phosphocreatine concentration or arterial [L(-)], and it is unlikely to simply reflect a finite energy store that becomes depleted at t(LIM).
Authors:
C Ferguson; H B Rossiter; B J Whipp; A J Cathcart; S R Murgatroyd; S A Ward
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Publication Detail:
Type:  Journal Article     Date:  2010-01-21
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  108     ISSN:  1522-1601     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-08-17     Completed Date:  2010-11-16     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:  866-74     Citation Subset:  IM    
Affiliation:
Institute of Membrane and Systems Biology, Faculty of Biological Sciences, University of Leeds, Leeds, United Kingdom. C.Ferguson@bio.gla.ac.uk
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MeSH Terms
Descriptor/Qualifier:
Exercise / physiology*
Exercise Test / instrumentation,  methods*
Exercise Tolerance / physiology*
Humans
Male
Oxygen Consumption
Physical Exertion / physiology*
Pulmonary Ventilation / physiology*
Recovery of Function / physiology*
Time Factors
Young Adult

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


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