The stretch-shortening cycle of the quadriceps femoris muscle group measured by isokinetic dynamometry
Deutscher übersetzter Titel: | Der Dehnungs-Verkuerzungs-Zyklus der Quadrizecps-femoris-Muskelgruppe gemessen mittels isokinetischer Dynamometrie |
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Autor: | Helgeson, Kevin; Gajdosik, Richard L. |
Erschienen in: | Journal of orthopaedic & sports physical therapy |
Veröffentlicht: | 17 (1993), 1, S. 17-23, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 0190-6011, 1938-1344 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU199411064760 |
Quelle: | BISp |
Abstract des Autors
The ability to measure the stretch-shortening cycle of isolated muscle groups has been limited. The purpose of this study was to measure the stretch-shortening cycle of the quadriceps femoris muscle group. Twenty-four volunteer subjects, 12 men and 12 women, participated in one test session; five men and five women also participated in a retest session; to examine the reliability of the test. A concentric contraction of the left quadriceps was measured for peak torque and time to peak torque on a Biodex isokinetic dynamometer under three conditions: 1) passive stretch before a concentric contraction, 2) isometric preload before a concentric contraction, and 3) eccentric preload before a concentric contraction. Conditions 2 and 3 showed a significant increase in peak torque production compared to condition. A significant difference was found for all three conditions between the men and women, with the men producing greatest peak torques. Conditions 2 and 3 also showed a significantly decreased time to peak torque compared with condition 1. The testing protocol was found to have high reliability. This testing protocol could be used to further study the stretch-shortening cycle in the quadriceps femoris muscle group. Verf.-Referat