Effects of a ten-second maximum voluntary contraction on regulatory myosin light-chain phosphorylation and dynamic performance measures
| Deutscher übersetzter Titel: | Auswirkungen einer 10 Sekunden dauernden maximalen willkürlichen Kontraktion auf die regulatorische „Myosin Light-Chain“ (RLC)-Phosphorylierung und dynamische Leistungsmesswerte |
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| Autor: | Smith, Jason Chadwick; Fry, Andrew C. |
| Erschienen in: | Journal of strength and conditioning research |
| Veröffentlicht: | 21 (2007), 1, 73-76, Lit. |
| Format: | Literatur (SPOLIT) |
| Publikationstyp: | Zeitschriftenartikel |
| Medienart: | Gedruckte Ressource |
| Sprache: | Englisch |
| ISSN: | 1064-8011, 1533-4287 |
| Schlagworte: | |
| Online Zugang: | |
| Erfassungsnummer: | PU201006004934 |
| Quelle: | BISp |
Abstract
The purpose of this investigation was to evaluate the role of an elevated regulatory myosin light-chain (RLC) phosphorylation on subsequent postactivation potentiation induced by a 10-second maximum voluntary contraction (MVC). With the use of a repeated measures design, data were collected from 11 recreationally active men who performed an explosive knee extension exercise with a load of 70% of their 1 repetition maximum. Muscle biopsies of their vastus lateralis were taken pre- and post-MVC. Seven subjects had elevated RLC phosphorylation (positive responders) and 4 had a decrease in RLC phosphorylation (negative responders). Percent change of force, velocity, and power measures did not differ between the 2 groups. Our results suggest that recreationally active men will not benefit from the effects of postactivation potentiation during performance with a 7-minute recovery period. Furthermore, we suggest that training status, strength, and skill level might be key determining factors for the positive benefits of postactivation potentiation during performance. Verf.-Referat