title: [Biochemical changes in skeletal muscles after chronic indirect stimulation].
abstract: The skeletal muscle has the capacity to respond adaptively to increased use. This observation could open up the feasibility of constructing pumping chambers to support or even replace cardiac work. We investigated the changes in enzyme activity due to chronic stimulation in an animal skeletal muscle. In 5 adult sheep the psoas muscle of one side was electrically stimulated through the muscle nerves, with an implantable stimulation unit for 5 weeks. The activity of the hexokinase (E.C.2.7.1.1.), lactate dehydrogenase (E.C.1.1.1.27), malate dehydrogenase (E.C.1.1.1.37), creatine kinase (E.C.2.7.3.2.) choline acetyltransferase and the contents of adenosine triphosphate and adenosine diphosphate were determined in bioptic specimen. The use of only 15 Hertz as a stimulation frequency led to a transformation of an originally fast-twitch muscle into a slow-twitch muscle with reduced susceptibility to fatigue. These results indicate a potential role of the skeletal muscle as an ideal myocardial substitute with the ability to perform hemodynamic work.
authors.forename: M P
authors.initials: MP
authors.lastname: Havel
authors.forename: R W
authors.initials: RW
authors.lastname: Kurz
authors.forename: G
authors.initials: G
authors.lastname: Schopf
authors.forename: M
authors.initials: M
authors.lastname: Frey
authors.forename: M
authors.initials: M
authors.lastname: Müller
authors.forename: E
authors.initials: E
authors.lastname: Wolner
mesh_terms: D000244:Adenosine Diphosphate / Q000378:metabolism; D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D002795:Choline O-Acetyltransferase / Q000378:metabolism; D003402:Creatine Kinase / Q000378:metabolism; D004558:Electric Stimulation; D006593:Hexokinase / Q000378:metabolism; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D008291:Malate Dehydrogenase / Q000378:metabolism; D009132:Muscles / Q000201:enzymology* / Q000378:metabolism; D012756:Sheep
chemical_list: D000244:Adenosine Diphosphate; D000255:Adenosine Triphosphate; D007770:L-Lactate Dehydrogenase; D008291:Malate Dehydrogenase; D002795:Choline O-Acetyltransferase; D006593:Hexokinase; D003402:Creatine Kinase
vernacular_title: Biochemische Veränderungen in Skelettmuskulatur nach chronischer indirekter Stimulation.