| Increases in muscle MCT are associated with reductions in muscle lactate after a single exercise session in humans. | |
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MedLine Citation:
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PMID: 11739096 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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To investigate the effects of a single session of prolonged cycle exercise [60% peak O2 uptake (VO2 peak) for 5-6 h] on metabolic adaptations in working vastus lateralis muscle, nine untrained males (peak O2 uptake = 47.2 +/- 1.1 ml x kg(-1) x min(-1), means +/- SE) were examined before (Pre) and at 2 (Post-2), 4 (Post-4), and 6 (Post-6) days after the training session. On the basis of 15 min of cycle exercise at 59% VO2 peak, it was found that training reduced (P < 0.05) exercise muscle lactate (mM) at Post-2 (6.65 +/- 0.69), Post-4 (7.74 +/- 0.63), and Post-6 (7.78 +/- 1.2) compared with Pre (10.9 +/- 1.3). No effect of training was observed on exercise ATP, phosphocreatine, and glycogen levels. After the single session of training, plasma volumes were elevated (P < 0.05) at Post-2 (6.7 +/- 1.7%), Post-4 (5.86 +/- 1.9), and Post-6 (5.13 +/- 2.5). The single exercise session also resulted in elevations (P < 0.05) in the monocarboxylate transporters MCT1 and MCT4 throughout the 6 days after exercise. Although epinephrine and norepinephrine both increased with exercise, only norepinephrine was reduced (P < 0.05) with training and only at Post-4. These results indicate that regulation of cellular lactate levels occurs rapidly and independently of other metabolic adaptations. It is proposed that increases in MCT and plasma volume are at least partly involved in the lower muscle lactate content observed after the training session by increasing lactate membrane transport and removal, respectively. |
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Authors:
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H Green; A Halestrap; C Mockett; D O'Toole; S Grant; J Ouyang |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: American journal of physiology. Endocrinology and metabolism Volume: 282 ISSN: 0193-1849 ISO Abbreviation: Am. J. Physiol. Endocrinol. Metab. Publication Date: 2002 Jan |
Date Detail:
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Created Date: 2001-12-12 Completed Date: 2002-01-16 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 100901226 Medline TA: Am J Physiol Endocrinol Metab Country: United States |
Other Details:
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Languages: eng Pagination: E154-60 Citation Subset: IM |
Affiliation:
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Department of Biochemistry, School of Medical Sciences, University of Bristol, Bristol BS8 1TD, United Kingdom. green@healthy.uwaterloo.ca |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Bicycling Blood Volume Epinephrine / blood Exercise / physiology* Humans Lactic Acid / metabolism* Male Monocarboxylic Acid Transporters / metabolism* Muscle Proteins* Muscle, Skeletal / metabolism* Norepinephrine / blood Symporters / metabolism* Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Monocarboxylic Acid Transporters; 0/Muscle Proteins; 0/SLC16A4 protein, human; 0/Symporters; 0/monocarboxylate transport protein 1; 50-21-5/Lactic Acid; 51-41-2/Norepinephrine; 51-43-4/Epinephrine |
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