Document Detail


Standardized protocol for a depletion of intramyocellular lipids (IMCL).
MedLine Citation:
PMID:  20213686     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Intramyocellular lipids (IMCL) are flexible fuel stores that are depleted by physical exercise and replenished by fat intake. IMCL or their degradation products are thought to interfere with insulin signaling thereby contributing to insulin resistance. From a practical point of view it is desirable to deplete IMCL prior to replenishing them. So far, it is not clear for how long and at which intensity subjects have to exercise in order to deplete IMCL. We therefore aimed at developing a standardized exercise protocol that is applicable to subjects over a broad range of exercise capacity and insulin sensitivity and allows measuring reliably reduced IMCL levels.Twelve male subjects, including four diabetes type 2 patients, with wide ranges of exercise capacity (VO(2)peak per total body weight 27.9-55.8 ml x kg(-1) x min(-1)), insulin sensitivity (glucose infusion rate per lean body mass 4.7-15.3 mg x min(-1) x kg(-1)), and BMI (21.7-31.5 kg x m(-2)), respectively, were enrolled. Using (1)H magnetic resonance spectroscopy ((1)H-MRS), IMCL was measured in m.tibialis anterior and m.vastus intermedius before and during a depletion protocol of a week, consisting of a moderate additional physical activity (1 h daily at 60% VO(2)peak) and modest low-fat (10-15%) diet.Absolute IMCL-levels were significantly reduced in both muscles during the first 3 days and stayed constant for the next 3 days of an identical diet/exercise-scheme. These reduced IMCL levels were independent of insulin sensitivity, yet a tendency to lower depleted IMCL levels has been observed in subjects with higher VO(2)peak.The proposed protocol is feasible in subjects with large differences in exercise capacity, insulin sensitivity, and BMI, leading to reduced IMCL levels that neither depend on the exact duration of the depletion protocol nor on insulin sensitivity. This allows for a standardized preparation of IMCL levels either for correlation with other physiological parameters or for replenishment studies.
Authors:
Michael Ith; Philipp M Huber; Andrea Egger; Jean-Paul Schmid; Roland Kreis; Emanuel Christ; Chris Boesch
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  NMR in biomedicine     Volume:  23     ISSN:  1099-1492     ISO Abbreviation:  NMR Biomed     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-06-21     Completed Date:  2010-09-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8915233     Medline TA:  NMR Biomed     Country:  England    
Other Details:
Languages:  eng     Pagination:  532-8     Citation Subset:  IM    
Affiliation:
Department of Clinical Research, MR Spectroscopy and Methodology, University Bern, Switzerland.
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MeSH Terms
Descriptor/Qualifier:
Adult
Exercise / physiology
Humans
Insulin / pharmacology
Lipid Metabolism / drug effects,  physiology*
Magnetic Resonance Spectroscopy / methods*,  standards*
Male
Middle Aged
Muscle Cells / drug effects,  metabolism*
Reference Standards
Young Adult
Chemical
Reg. No./Substance:
11061-68-0/Insulin

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


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