An electromyographic investigation of 4 elastic-tubing closed kinetic chain exercises after anterior cruciate ligament reconstruction
Deutscher übersetzter Titel: | Eine elektromyographische Untersuchung von vier Uebungen der geschlossenen kinetischen Kette mit dem Elastikband nach Rekonstruktion des vorderen Kreuzbandes |
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Autor: | Schulthies, S.S.; Ricard, M.D.; Alexander, K.J.; Myrer, J.W. |
Erschienen in: | Journal of athletic training |
Veröffentlicht: | 33 (1998), 4, S. 328-335, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Elektronische Ressource (online) Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 1062-6050, 0160-8320, 1938-162X |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU199903307669 |
Quelle: | BISp |
Abstract des Autors
Objective: To determine the electromyographic (EMG) activity of the vastus medialis oblique (VMO), vastus lateralis (VL), semitendinosus and semimembranosus (ST), and biceps femoris (BF) muscles during 4 elastic-tubing closed kinetic chain exercises in postoperative patients with anterior cruciate ligament (ACL)-reconstructed knees. Design and Setting: A 4 x 4 repeated-measures analysis of variance design guided this study. Independent variables were type of exercise and muscle; the dependent variable was EMG activity. Subiects: Fifteen patents, 5 to 24 weeks after ACL reconstruction. Measurements: Subjects performed 4 exercises (front pull, back pull, crossover, reverse crossover) with elastic tubing attached to the foot of the uninjured leg. Time- and amplitude-normalized EMG activity was recorded from the VMO, VL, ST, and BF muscles of the injured leg. The hamstrings:quadriceps ratio was calculated. Results: The normalized VMO, VL, and BF EMG activity ranged from 25% to 50% of maximum voluntary isometric contraction for the 4 exercises. The ST ranged from 12% on the back pull to 58% on the front pull. The hamstrings:quadriceps ratios were 137% (front pull), 115% (crossover), 70% (back pull), and 60% (reverse crossover). Conclusions: We suggest that clinicians use these exercises during early ACL rehabilitation since they incorporate early weightbearing with hamstring and quadriceps coactivation. Verf.-Referat