Eccentric muscle movements - Why Generate more power? Why Generate more trauma?

  • Bernardo Neme Ide Laboratório de Bioquí­mica do Exercí­cio - LABEX Instituto de Biologia - Universidade Estadual de Campinas - UNICAMP
  • Clodoaldo José Dechechi Laboratório de Bioquí­mica do Exercí­cio - LABEX Instituto de Biologia - Universidade Estadual de Campinas - UNICAMP. Faculdades Estácio de Sá - FAESO - Ourinhos São Paulo
  • Charles Ricardo Lopes Laboratório de Bioquí­mica do Exercí­cio - LABEX Instituto de Biologia - Universidade Estadual de Campinas - UNICAMP
  • René Brenzikofer Laboratório de Instrumentação para Biomecânica (LIB) Faculdade de Educação Fí­sica, Unicamp Campinas Brasil
  • Denise Vaz de Macedo Laboratório de Bioquí­mica do Exercí­cio - LABEX Instituto de Biologia - Universidade Estadual de Campinas - UNICAMP. Laboratório de Instrumentação para Biomecânica (LIB) Faculdade de Educação Fí­sica, Unicamp Campinas Brasil. Faculdades Estácio de Sá - FAESO - Ourinhos São Paulo
Keywords: Muscular contraction, Eccentric action, Residual increase, Strength, Action potential, Titina

Abstract

The models proposed by Huxley of crossbridges and sliding of myofilaments normally explain the molecular and cellular mechanisms that occur during all kinds of muscular actions. However, these models cannot explain the residual force enhancement consistently observed in skeletal muscles following active stretching and its complete molecular mechanisms remains unknown. The literature points the development of sarcomere length non-uniformities and the engagement of passive elements as responsible to this residual force enhancement. The purpose of this study was to review the recent hypothesis to explain the generation and increase of force during and after eccentric contractions. We discussed about the cross- bridge theory and ATP hydrolysis during the concentric and eccentric actions. The molecular consequences of the continuity of the action potential in the formation of thecross-bridges and the action of the proteins titin, nebulin, miomesin and protein C as passive elements in the generation of force during the sarcomere stretching and in the maintenance of the myofibril integrity.

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Published
2012-01-02
How to Cite
Ide, B. N., Dechechi, C. J., Lopes, C. R., Brenzikofer, R., & Macedo, D. V. de. (2012). Eccentric muscle movements - Why Generate more power? Why Generate more trauma?. Brazilian Journal of Exercise Prescription and Physiology, 5(25). Retrieved from https://www.rbpfex.com.br/index.php/rbpfex/article/view/303
Issue
Vol. 5 No. 25 (2011)
Section
Scientific Articles - Original

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