Eccentric/concentric ratios at selected velocities for the invertor and evertor muscles of the chronically unstable ankle
Deutscher übersetzter Titel: | Exzentrische/konzentrische maximale Kraftmoment-Beziehungen bei ausgesuchten Kontraktionsgeschwindigkeiten fuer die inversions- und eversionsbewirkenden Muskeln am chronisch instabilen Sprunggelenk |
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Autor: | Hartsell, H.D.; Spaulding, S.J. |
Erschienen in: | British journal of sports medicine |
Veröffentlicht: | 33 (1999), 4, S. 255-258, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 0306-3674, 1473-0480 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU199909401819 |
Quelle: | BISp |
Abstract des Autors
Objective: The use of muscle balancing by the clinician to determine return to activity or discharge of a patient is not a well understood measure. Because of the lack of information on the poorly understood concept of eccentric/concentric (E/C) ratios at the ankle, the purpose was to determine the E/C ratios for the invertor and evertor muscles at various velocities in healthy and chronically unstable ankles. Methods: Ten subjects with healthy ankles and 14 with chronically unstable ankles performed five maximal effort reciprocal eccentric/contraction contractions on an isokinetic dynamometer at four velocities (60, 120, 180, and 240ø/s) and for each physiological movement of inversion and eversion. Data were analysed using a two way mixed model analysis of variance with repeated measures, with Tukey's test used for post hoc analysis. Results: Although the chronically unstable ankle was significantly weaker (p<0.05) eccentrically and concentrically for inversion and eversion, the main effect of the E/C ratios for the ankle was not significant for either joint motion. The main effect of velocity was significant (p<0.05) for each joint motion, but no significant interaction effects were observed. As velocity increased, the E/C ratio increased, except at 180 and 240ø/s for either ankle group. Conclusions: Chronic ankle instability and muscle weakness co-exist. Adequate E/C ratios in the chronically unstable ankle may exist in the absence of normal strength values. Verf.-Referat