Document Detail


Leg glucose and protein metabolism during an acute bout of resistance exercise in humans.
MedLine Citation:
PMID:  15194677     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The present study investigated the responses of leg glucose and protein metabolism during an acute bout of resistance exercise. Seven subjects (5 men, 2 women) were studied at rest and during a strenuous lower body resistance exercise regimen consisting of approximately 8 sets of 10 repetitions of leg press at approximately 75% 1 repetition maximum and 8 sets of 8 repetitions of knee extensions at approximately 80% 1 repetition maximum. L-[ring-2H5]phenylalanine was infused throughout the study for measurement of phenylalanine rates of appearance, disappearance, protein synthesis, and protein breakdown across the leg. Femoral arterial and venous blood samples were collected at rest and during exercise for determination of leg blood flow, concentrations of glucose, lactate, alanine, glutamine, glutamate, leucine, and phenylalanine, and phenylalanine enrichments. Muscle biopsies were obtained at rest and immediately after exercise. Leg blood flow was nearly three times (P <0.009) higher and glucose uptake more than five times higher (P=0.009) during exercise than at rest. Leg lactate release was 86 times higher than rest during the exercise bout. Although whole body phenylalanine rate of appearance, an indicator of whole body protein breakdown, was reduced during exercise; leg phenylalanine rate of appearance, rate of disappearance, protein synthesis, and protein breakdown did not change. Arterial and venous alanine concentrations and glutamate uptake were significantly higher during exercise than at rest. We conclude that lower body resistance exercise potently stimulates leg glucose uptake and lactate release. In addition, muscle protein synthesis is not elevated during a bout of resistance exercise.
Authors:
William J Durham; Sharon L Miller; Catherine W Yeckel; David L Chinkes; Kevin D Tipton; Blake B Rasmussen; Robert R Wolfe
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.     Date:  2004-06-11
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  97     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2004 Oct 
Date Detail:
Created Date:  2004-09-10     Completed Date:  2005-04-18     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1379-86     Citation Subset:  IM; S    
Affiliation:
Metabolism Unit, Shriners Burns Hospital, Galveston, University of Texas, Galveston, Texas 77550, USA. wdurham@bcm.tmc.edu
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological / physiology
Adult
Blood Flow Velocity / physiology
Blood Glucose / metabolism*
Exercise Test
Exercise Tolerance / physiology*
Female
Humans
Leg / blood supply,  physiology*
Male
Metabolic Clearance Rate
Muscle Proteins / metabolism*
Muscle, Skeletal / blood supply,  physiology*
Physical Exertion / physiology*
Weight Lifting / physiology*
Grant Support
ID/Acronym/Agency:
DK-38010/DK/NIDDK NIH HHS; M01 RR-00073/RR/NCRR NIH HHS
Chemical
Reg. No./Substance:
0/Blood Glucose; 0/Muscle Proteins

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