Acute changes in hamstrings musculo-articular dissipative properties induced by cyclic and static stretching
Deutscher übersetzter Titel: | Akute Veränderungen thermoregulierender Eigenschaften der ischiocruralen Muskulatur durch zyklisches und statisches Stretchen |
---|---|
Autor: | Nordez, A.; McNair, P.; Casari, P.; Cornu, C. |
Erschienen in: | International journal of sports medicine |
Veröffentlicht: | 29 (2008), 5, S. 414-418, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource Elektronische Ressource (online) |
Sprache: | Englisch |
ISSN: | 0172-4622, 1439-3964 |
DOI: | 10.1055/s-2007-964980 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU200809002838 |
Quelle: | BISp |
Abstract
This study was designed to measure changes in musculo-articular dissipative properties related to viscosity that were induced by passive cyclic and static stretching. Musculo-articular dissipative properties were assessed by calculating a dissipation coefficient using potential elastic energies stored and restituted during cyclic stretching. Eight subjects performed five passive knee extensions/flexions cycles on a Biodex® dynamometer at 5°/s to 80% of their maximal range of motion before and after a static stretching protocol. Electromyographic activity from the hamstring muscles was monitored and remained constant during cyclic stretching and after static stretching (p>0.05). The dissipation coefficient decreased during cyclic stretching (-28.8+/-6.0%, p<0.001), while it was slightly increased after static stretching (+3.8+/-5.0%, p=0.037). The findings showed that energy stored and energy restituted decreased during cyclic stretching and after static stretching (p<0.05). During unloading, passive torque remained constant during cyclic stretching, but was decreased after static stretching. The findings indicate that musculo-articular dissipative properties were primarily affected by a single cycle of motion, and were not influenced by static stretching procedures. The decrease in dissipation coefficient following cyclic motion indicates that the musculo-articular system displays thixotropic behavior. Verf.-Referat