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The Journal of Physiology
Article . 2004 . Peer-reviewed
License: Wiley Online Library User Agreement
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Effects of aerobic training on pyruvate dehydrogenase and pyruvate dehydrogenase kinase in human skeletal muscle

Authors: Paul J, LeBlanc; Sandra J, Peters; Rebecca J, Tunstall; David, Cameron-Smith; George J F, Heigenhauser;

Effects of aerobic training on pyruvate dehydrogenase and pyruvate dehydrogenase kinase in human skeletal muscle

Abstract

This study examined the effects of short‐ and long‐term aerobic training on the stable up‐regulation of pyruvate dehydrogenase (PDH) and PDH kinase (PDK) in human skeletal muscle. We hypothesized that 8 weeks, but not 1 week, of aerobic training would increase total PDH (PDHt) and PDK activities compared to pretraining, and this would be detectable at the level of gene transcription (mRNA) and/or gene translation (protein). Resting muscle biopsies were taken before and after 1 and 8 weeks of aerobic cycle exercise training. PDHt and PDK activities, and their respective protein and mRNA expression, did not differ after 1 week of aerobic training. PDHt activity increased 31% after 8 weeks and this may be partially due to a 1.3‐fold increase in PDH‐E1α protein expression. PDK activity approximately doubled after 8 weeks of aerobic training and this was attributed to a 1.3‐fold increase in PDK2 isoform protein expression. Similar to 1 week, no changes were observed at the mRNA level after 8 weeks of training. These findings suggest that aerobically trained human skeletal muscle has an increased maximal capacity to utilize carbohydrates, evident by increased PDHt, but increased metabolic control sensitivity to pyruvate through increased contribution of PDK2 to total PDK activity.

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Keywords

Adult, Male, Electron Transport Complex II, Biopsy, Needle, Pyruvate Dehydrogenase Acetyl-Transferring Kinase, Pyruvate Dehydrogenase Complex, Citrate (si)-Synthase, Protein Serine-Threonine Kinases, Adaptation, Physiological, Gene Expression Regulation, Enzymologic, Bicycling, Mitochondria, Muscle, Electron Transport Complex IV, Protein Subunits, Carbohydrate Metabolism, Humans, RNA, Messenger, Muscle, Skeletal, Exercise, Protein Kinases

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    popularity
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    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
59
Top 10%
Top 10%
Top 10%
bronze