Journal of Molecular Imaging & Dynamics
Open Access
ISSN: 2155-9937
ISSN: 2155-9937
J. Slater
Tanzania
Research Article
Quantification of Changes in Skeletal Muscle Amino Acid Kinetics in Adult Humans in Response to Exercise via Positron-emission Tomography with L-[methyl-11C] methionine
Author(s): R. Harnish, T. Streeper, I. Saeed, C. Schreck, S. Dannoon, J. Slater, J. Blecha, H. VanBrocklin, M. Hernandez-Pampaloni, R. Hawkins, Y. Seo, G. Sayre and T. LangR. Harnish, T. Streeper, I. Saeed, C. Schreck, S. Dannoon, J. Slater, J. Blecha, H. VanBrocklin, M. Hernandez-Pampaloni, R. Hawkins, Y. Seo, G. Sayre and T. Lang
Dynamic positron emission tomography (PET) imaging of with L-[methyl- 11 C]methionine (11C-MET) was developed in the late 1990’s to non-invasively estimate skeletal muscle protein synthesis, but no studies have shown that the measurements respond to resistance exercise, which stimulates protein synthesis in humans. Ten healthy women aged 25-75 years underwent a 14-hour fast, followed by unilateral knee extension and flexion exercise and consumption of an 8-ounce serving of fruit juice. Five subjects underwent dynamic 11C-MET PET imaging of the mid-thigh 2-3 hours after exercise and five were imaged 1 hour after exercise. Images were processed to obtain the Patlak slope K i , which describes the fractional extraction rate of 11C-MET into skeletal muscle protein. Additionally, the images were processed with a three-compartment kinetic model to determine rate constants for 11C-MET .. View More»
DOI:
10.4172/2155-9937.1000103