Document Detail


Brief intense exercise followed by passive recovery modifies the pattern of fuel use in humans during subsequent sustained intermittent exercise.
MedLine Citation:
PMID:  11437738     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The role of work period duration as the principal factor influencing carbohydrate metabolism during intermittent exercise has been investigated. Fuel oxidation rates and muscle glycogen and free carnitine content were compared between two protocols of sustained intermittent intense exercise with identical treadmill speed and total work duration. In the first experiment subjects (n=6) completed 40 min of intermittent treadmill running involving a work : recovery cycle of 6 : 9 s or 24 : 36 s on separate days. With 24 : 36 s exercise a higher rate of carbohydrate oxidation approached significance (P=0.057), whilst fat oxidation rate was lower (P < or = 0.01) and plasma lactate concentration higher (P < or = 0.01). Muscle glycogen was lower post-exercise with 24 : 36 s (P < or = 0.05). Muscle free carnitine decreased (P < or = 0.05), but there was no difference between protocols. In the second experiment a separate group of subjects (n=5) repeated the intermittent exercise protocols with the addition of a 10-min bout of intense exercise, followed by 43 +/- 5 min passive recovery, prior to sustained (40 min) intermittent exercise. For this experiment the difference in fuel use observed previously between 6 : 9 s and 24 : 36 s was abolished. Carbohydrate and fat oxidation, plasma lactate and muscle glycogen levels were similar in 6 : 9 s and 24 : 36 s. When compared with the first experiment, this result was because of reduced carbohydrate oxidation in 24 : 36 s (P < or = 0.05). There was no difference, and no change, in muscle free carnitine between protocols. A 10-min bout of intense exercise, followed by 43 +/- 5 min of passive recovery, substantially modifies fuel use during subsequent intermittent intense exercise.
Authors:
M A Christmass; B Dawson; C Goodman; P G Arthur
Related Documents :
729568 - Effect of decreased availability of substrates on intramuscular triglyceride utilizatio...
405758 - The opsonic activity of stored blood.
7304208 - Lactate concentrations after short, maximal exercise at various glycogen levels.
17402488 - Effects of dietary glycaemic response after exercise on blood concentrations of substra...
23042908 - Exercise training improves cardiac function and attenuates arrhythmia in cpvt mice.
22215288 - Effect of inter-repetition rest on ratings of perceived exertion during multiple sets o...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Acta physiologica Scandinavica     Volume:  172     ISSN:  0001-6772     ISO Abbreviation:  Acta Physiol. Scand.     Publication Date:  2001 May 
Date Detail:
Created Date:  2001-07-04     Completed Date:  2001-08-30     Revised Date:  2005-11-17    
Medline Journal Info:
Nlm Unique ID:  0370362     Medline TA:  Acta Physiol Scand     Country:  England    
Other Details:
Languages:  eng     Pagination:  39-52     Citation Subset:  IM    
Affiliation:
Department of Biochemistry, The University of Western Australia, Nedlands, Australia.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adult
Carbohydrate Metabolism*
Carnitine / metabolism
Exercise / physiology*
Exercise Test
Fats / metabolism
Glycogen / metabolism
Humans
Lactic Acid / blood
Muscle, Skeletal / metabolism
Oxidation-Reduction
Oxygen Consumption
Running / physiology
Time Factors
Chemical
Reg. No./Substance:
0/Fats; 50-21-5/Lactic Acid; 541-15-1/Carnitine; 9005-79-2/Glycogen

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


Previous Document:  Caffeine stimulates the reverse mode of Na/Ca2+ exchanger in ferret ventricular muscle.
Next Document:  2,3-Butanedione monoxime increases speed of relaxation in single muscle fibres of frog.