Document Detail

Effects of prior very-heavy intensity exercise on indices of aerobic function and high-intensity exercise tolerance.
MedLine Citation:
PMID:  17540836     Owner:  NLM     Status:  MEDLINE    
A recent bout of high-intensity exercise can alter the balance of aerobic and anaerobic energy provision during subsequent exercise above the lactate threshold (theta(L)). However, it remains uncertain whether such "priming" influences the tolerable duration of subsequent exercise through changes in the parameters of aerobic function [e.g., theta(L), maximum oxygen uptake (Vo(2max))] and/or the hyperbolic power-duration (P-t) relationship [critical power (CP) and the curvature constant (W')]. We therefore studied six men performing cycle ergometry to the limit of tolerance; gas exchange was measured breath-by-breath and arterialized capillary blood [lactate] was measured at designated intervals. On different days, each subject completed 1) an incremental test (15 W/min) for estimation of theta(L) and measurement of the functional gain (DeltaVo(2)/DeltaWR) and Vo(2peak) and 2) four constant-load tests at different work rates (WR) for estimation of CP, W', and Vo(2max). All tests were subsequently repeated with a preceding 6-min supra-CP priming bout and an intervening 2-min 20-W recovery. The hyperbolicity of the P-t relationship was retained postpriming, with no significant difference in CP (241 +/- 39 vs. 242 +/- 36 W, post- vs. prepriming), Vo(2max) (3.97 +/- 0.34 vs. 3.93 +/- 0.38 l/min), DeltaVo(2)/DeltaWR (10.7 +/- 0.3 vs. 11.1 +/- 0.4 ml.min(-1).W(-1)), or the fundamental Vo(2) time constant (25.6 +/- 3.5 vs. 28.3 +/- 5.4 s). W' (10.61 +/- 2.07 vs. 16.13 +/- 2.33 kJ) and the tolerable duration of supra-CP exercise (-33 +/- 11%) were each significantly reduced, despite a less-prominent Vo(2) slow component. These results suggest that, following supra-CP priming, there is either a reduced depletable energy resource or a residual fatigue-metabolite level that leads to the tolerable limit before this resource is fully depleted.
C Ferguson; B J Whipp; A J Cathcart; H B Rossiter; A P Turner; S A Ward
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Publication Detail:
Type:  Journal Article     Date:  2007-05-31
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  103     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2007 Sep 
Date Detail:
Created Date:  2007-08-28     Completed Date:  2007-12-20     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:  812-22     Citation Subset:  IM    
Centre for Sport and Exercise Sciences, Institute of Membrane and Systems Biology, Worsley Bldg., Univ. of Leeds, Leeds, LS2 9JT, United Kingdom.
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MeSH Terms
Exercise / physiology*
Exercise Test
Exercise Tolerance / physiology*
Pulmonary Ventilation / physiology*

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