| Lactate removal is not enhanced in nonstimulated perfused skeletal muscle after endurance training. | |
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MedLine Citation:
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PMID: 11247928 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The effects of endurance training (running 40 m/min grade for 60 min, 5 days/wk for 8 wk) on skeletal muscle lactate removal was studied in rats by utilizing the isolated hindlimb perfusion technique. Hindlimbs were perfused (single-pass) with Krebs-Henseleit bicarbonate buffer, fresh bovine erythrocytes (hematocrit approximately 30%), 10 mM lactate, and [U-14C]lactate (30,000 dpm/ml). Arterial and venous blood samples were collected every 10 min for the duration of the experiment to assess lactate uptake. During perfusions, no significant differences in skeletal muscle lactate uptake were observed between trained (7.31 +/- 0.20 micromol/min) and control hindlimbs (6.98 +/- 0.43 micromol/min). In support, no significant differences were observed for [14C]lactate uptake in trained (22,776 +/- 370 dpm/min) compared with control hindlimbs (21,924 +/- 1,373 dpm/min). Concomitant with these observations, no significant differences were observed between groups for oxygen consumption (4.93 +/- 0.18 vs. 4.92 +/- 0.13 micromol/min), net skeletal muscle glycogen synthesis (7.1 +/- 0.4 vs. 6.5 +/- 0.3 micromol x 40 min(-1) x g(-1)), or 14CO2 production (2,203 +/- 185 vs. 2,098 +/- 155 dpm/min), trained and control, respectively. These findings indicate that endurance training does not affect lactate uptake or alter the metabolic fate of lactate in quiescent skeletal muscle. |
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Authors:
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K D Sumida; C M Donovan |
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Publication Detail:
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Type: In Vitro; Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 90 ISSN: 8750-7587 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2001 Apr |
Date Detail:
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Created Date: 2001-03-15 Completed Date: 2001-05-31 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 1307-13 Citation Subset: IM |
Affiliation:
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Department of Biological Sciences, Chapman University, Orange, California 92866, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Blood Pressure / physiology Female Gluconeogenesis / physiology Glycogen / metabolism Hindlimb / physiology Lactic Acid / metabolism* Muscle, Skeletal / metabolism* Oxidation-Reduction Oxygen Consumption / physiology Perfusion Physical Conditioning, Animal / physiology* Physical Endurance / physiology* Rats Rats, Wistar |
| Grant Support | |
ID/Acronym/Agency:
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DK-48000/DK/NIDDK NIH HHS |
| Chemical | |
Reg. No./Substance:
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50-21-5/Lactic Acid; 9005-79-2/Glycogen |
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