Fully isometric length-force curves of rat muscle differ from those during and after concentric contractions
Deutscher übersetzter Titel: | Im Rattenmuskel unterscheiden sich die Laenge-Kraft-Kurven bei ausschliesslich isometrischer Kontraktion von denen waehrend und nach konzentrischer Muskelkontraktion |
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Autor: | Meijer, K.; Grootenboer, H.J.; Koopman, B.F.J.M.; Huijing, P.A. |
Erschienen in: | Journal of applied biomechanics |
Veröffentlicht: | 13 (1997), 2, S. 164-181, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource Elektronische Ressource (Datenträger) |
Sprache: | Englisch |
ISSN: | 1065-8483, 1543-2688 |
DOI: | 10.1123/jab.13.2.164 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU199804301578 |
Quelle: | BISp |
Abstract des Autors
The effect of various shortening histories on postshortening isometric length-force characteristics of rat medial gastrocnemius (GM) was studied. Active muscle force and muscle geometry were analyzed after isotonic as well as isokinetic shortening. Active shortening significantly changed GM length-force characteristics (i.e., maximal muscle force, optimum muscle length, and active slack length). Muscle geometry did not change, which indicates that the observed changes in length-force curves are related to intracellular processes. Length-force curves valid during shortening, derived from postshortening characteristics, were very different from the fully isometric length-force curve. Their most remarkable feature was the absence of a negative slope. It was concluded that the length-force curve valid during active shortening strongly depends upon shortening characteristics (i.e., initial length and shortening speed). As a consequence, the traditional, fully isometric, length-force curve is a poor estimator of the length-force curve during dynamic contractions of muscle. Implications for muscle function are discussed. Verf.-Referat