Document Detail


No difference in net uptake or disposal of lactate by trained and untrained forearms during incremental sodium lactate infusion.
MedLine Citation:
PMID:  11606009     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A number of training adaptations in skeletal muscle might be expected to enhance lactate extraction during hyperlactataemia. The aim of the present study was to determine whether resting endurance-trained forearms exhibit an increased net lactate removal during hyperlactataemia. Six racquet-sport players attended the laboratory for two experiments, separated by 2 weeks. In the first experiment incremental handgrip exercise to fatigue was performed to identify trained (TRFA, n = 6) and untrained (UTFA, n = 5) forearms. In the second experiment net forearm lactate exchange was compared between TRFA and UTFA during an incremental infusion of sodium lactate. TRFA performed more work than UTFA during handgrip exercise [mean (SE) TRFA, 66.1 (9.5) J.100 ml(-1); UTFA, 35.1 (2.3) J.100 ml(-1); P = 0.02] and UTFA exhibited a greater increase in net lactate output relative to work load (P = 0.003). During lactate infusion net lactate uptake across the resting forearms increased linearly with the arterial lactate concentration in both groups (TRFA, r = -0.95 (0.03); UTFA, r= -0.92 (0.04); P < 0.02], with no difference in the regression slopes [TRFA, -1.06 (0.13); UTFA, -1.07 (0.27); P = 0.97] or y-intercepts [TRFA, 0.67 (0.20); UTFA, 1.36 (0.67); P = 0.37] between groups. Almost all of the lactate taken up was disposed of by both groups of forearms [TRFA, 99.6 (0.2)%; UTFA, 98.5 (1.0)%; P = 0.37]. It was concluded that the net uptake and removal of lactate by resting skeletal muscle is a function of the concentration of lactate in the blood perfusing the muscle rather than the muscle training status.
Authors:
J D Buckley; G C Scroop; P G Catcheside
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article    
Journal Detail:
Title:  European journal of applied physiology     Volume:  85     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2001 Sep 
Date Detail:
Created Date:  2001-10-18     Completed Date:  2002-03-12     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  412-9     Citation Subset:  IM    
Affiliation:
Centre for Research in Education and Sports Science, University of South Australia, Underdale. j.buckley@unisa.edu.au
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MeSH Terms
Descriptor/Qualifier:
Adult
Exercise / physiology*
Forearm / physiology*
Hand Strength / physiology
Humans
Male
Muscle, Skeletal / blood supply,  metabolism
Racquet Sports / physiology
Regional Blood Flow / physiology
Sodium Lactate / blood,  pharmacokinetics*
Chemical
Reg. No./Substance:
72-17-3/Sodium Lactate

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


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