Fatigue during stretch-shortening cycle exercise: changes in mechanical performance of human skeletal muscle

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Deutscher übersetzter Titel:Ermuedung bei exzentrisch-konzentrischen Muskelkontraktionen: Veraenderungen der mechanischen Leistung im menschlichen Skelettmuskel
Autor:Gollhofer, Albert; Komi, P.V.; Miyashita, M.; Aura, O.
Erschienen in:International journal of sports medicine
Veröffentlicht:8 (1987), 2, S. 71-78, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Gedruckte Ressource Elektronische Ressource (online)
Sprache:Englisch
ISSN:0172-4622, 1439-3964
DOI:10.1055/s-2008-1025644
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Erfassungsnummer:PU198706030392
Quelle:BISp

Abstract

Stretch-shortening cycle (SSC) was used as a model to investigate muscular fatigue. Nine male volunteers were subjected to 100 repeated and exhaustive SSC contractions of the forearm extensors using a special sledge apparatus incorporating a force plate system. The fatigue contractions were performed on submaximal levels but the before-after comparison also included maximal dropjump condition on the sledge as well as falls on to the floor. The results indicated that in the 100 submaximal SSCs the fatigue was characterized by increases in the contact times for both the eccentric and concentric phases of SSC, but the influence was more pronounced on the concentric part. The force-time curves during contact on the platform were influenced by fatigue so that the initial force peak became higher and the subsequent initial drop of force more pronounced. With progressing fatigue, the eccentric maximal angular velocity increased and the corresponding concentric velocities decreased. The results suggest that repeated SSC induces fatigue and the fatigue effects on the mechanical behavior of the muscle are very much similar to those induced by either isometric or concentric fatigue contractions. However, the transfer of the energy between eccentric and concentric phases was drastically reduced and this implies that SSCs can be used effectively to examine the fatiguability of the system regulating muscle stiffness during exercise. Verf.-Referat