Association Between Biochemical And Physiological Properties In Single Motor Units
Motor units from the cat tibialis posterior muscle were examined for an association between physiological and biochemical properties. Functionally isolated motor units were categorized on the basis of their physiological properties. This was followed by quantitative microbiochemical analysis of single muscle fibers from each unit, identified in cross sections using the glycogenâ€depletion method. The activities of malate dehydrogenase and Î²;â€hydroxyacylâ€CoA dehydrogenase distinguished between fatigable (type FF) and fatigueâ€resistant (types FR and S) units. The activities of both lactate dehydrogenase and adenylokinase were higher in fastâ€than in slowâ€contracting units. Cluster analyses, based on both physiological and biochemical properties alone, produced groupings identical to types FF, FR, and S. The association between physiological and biochemical properties substantiates the idea that biochemically distinct groups of motor units correspond to physiologically identifiable groups. Copyright Â© 1988 John Wiley & Sons, Inc.
Muscle & Nerve
Digital Object Identifier (DOI)
Hamm, Thomas M.; Nemeth, Patti M.; Solanki, Lata; Gordon, Debra A.; Reinking, Robert M.; and Stuart, Douglas G., "Association Between Biochemical And Physiological Properties In Single Motor Units" (1988). Neurobiology. 78.