Document Detail


Influence of repeated sprint training on pulmonary O2 uptake and muscle deoxygenation kinetics in humans.
MedLine Citation:
PMID:  19342439     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We hypothesized that a short-term training program involving repeated all-out sprint training (RST) would be more effective than work-matched, low-intensity endurance training (ET) in enhancing the kinetics of oxygen uptake (Vo(2)) and muscle deoxygenation {deoxyhemoglobin concentration ([HHb])} following the onset of exercise. Twenty-four recreationally active subjects (15 men, mean +/- SD: age 21 +/- 4 yr, height 173 +/- 9 cm, body mass 71 +/- 11 kg) were allocated to one of three groups: RST, which completed six sessions of four to seven 30-s RSTs; ET, which completed six sessions of work-matched, moderate-intensity cycling; and a control group (CON). All subjects completed moderate-intensity and severe-intensity "step" exercise transitions before (Pre) and after the 2-wk intervention period (Post). Following RST, [HHb] kinetics were speeded, and the amplitude of the [HHb] response was increased during both moderate and severe exercise (P < 0.05); the phase II Vo(2) kinetics were accelerated for both moderate (Pre: 28 +/- 8, Post: 21 +/- 8 s; P < 0.01) and severe (Pre: 29 +/- 5, Post: 23 +/- 5 s; P < 0.05) exercise; the amplitude of the Vo(2) slow component was reduced (Pre: 0.52 +/- 0.19, Post: 0.40 +/- 0.17 l/min; P < 0.01); and exercise tolerance during severe exercise was improved by 53% (Pre: 700 +/- 234, Post: 1,074 +/- 431 s; P < 0.01). None of these parameters was significantly altered in the ET and CON groups. Six sessions of RST, but not ET, resulted in changes in [HHb] kinetics consistent with enhanced fractional muscle O(2) extraction, faster Vo(2) kinetics, and an increased tolerance to high-intensity exercise.
Authors:
Stephen J Bailey; Daryl P Wilkerson; Fred J Dimenna; Andrew M Jones
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Publication Detail:
Type:  Journal Article     Date:  2009-04-02
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  106     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-05-27     Completed Date:  2009-07-07     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:  1875-87     Citation Subset:  IM    
Affiliation:
University of Exeter, Exeter, Devon, EX1 2LU, UK.
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological / physiology*
Bicycling / physiology*
Exercise / physiology*
Exercise Test
Female
Hemoglobins / analysis,  metabolism
Humans
Lung / metabolism*
Male
Muscle, Skeletal / metabolism*
Oxygen / metabolism
Oxygen Consumption / physiology*
Spectroscopy, Near-Infrared
Young Adult
Chemical
Reg. No./Substance:
0/Hemoglobins; 7782-44-7/Oxygen; 9008-02-0/deoxyhemoglobin

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


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