Quadriceps concentric EMG activity is greater than eccentric EMG activity during the lateral step-up exercise
| Deutscher übersetzter Titel: | Bei seitlichen Step-up-Übungen ist die konzentrische EMG-Aktivität des M. quadriceps größer als die exzentrische EMG-Aktivität |
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| Autor: | Selseth, Angie; Dayton, Marilyn; Cordova, Mitchell L.; Ingersoll, Christopher D.; Merrick, Mark A. |
| Erschienen in: | Journal of sport rehabilitation |
| Veröffentlicht: | 9 (2000), 2, S. 124-134, Lit. |
| Format: | Literatur (SPOLIT) |
| Publikationstyp: | Zeitschriftenartikel |
| Medienart: | Gedruckte Ressource |
| Sprache: | Englisch |
| ISSN: | 1056-6716, 1543-3072 |
| Schlagworte: | |
| Online Zugang: | |
| Erfassungsnummer: | PU200009000194 |
| Quelle: | BISp |
Abstract des Autors
Purpose: To analyze vastus medialis obliquus (VMO) and vastus lateralis (VL) muscle activity during the concentric and eccentric phases of a lateral step-up exercise. Design: Repeated-measures. Dependent variable: the integrated electromyogram measured as a percentage of the maximal voluntary isometric contraction of the VMO and VL muscles. Independent variable: muscle contraction with 2 levels (concentric and eccentric). Subjects: Twenty-three volunteers with no previous history of knee surgery or anterior knee pain. Methods: Surface electrodes were positioned over the VMO and VL, and electromyographic data were collected during the exercise. Results: The 2 muscle phases of contraction were different when both dependent variables were considered simultaneously (F2,17=33.2, P<.001). Concentric contractions produced greater muscle activity for VL (P<.05) and VMO (P<.05). Conclusions: Because concentric contractions produce greater activity than eccentric contractions do during the lateral step-up exercise, they provide a stronger stimulus for muscle activation, which might result in greater muscle strength gains. Verf.-Referat