Passive energy return after repeated stretches of the hamstring muscle-tendon unit
Deutscher übersetzter Titel: | Erholung der passiven Energie nach wiederholten Dehnungen der Muskel-Sehnen-Einheit der Hamstrings |
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Autor: | Magnusson, S.P.; Aagaard, P.; Nielson, J.J. |
Erschienen in: | Medicine and science in sports and exercise |
Veröffentlicht: | 32 (2000), 6, S. 1160-1164, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 0195-9131, 1530-0315 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU199912407571 |
Quelle: | BISp |
Abstract des Autors
It has been shown that five repetitive static stretches of human hamstring muscle, each lasting 90 s and separated by 30 s, altered the passive properties on a short-term basis. However, a total of 7.5 min (5 x 90 s) of stretching for a single muscle group may be an unrealistic stretching program. Purpose: The present investigation examined whether three repeated 45-s static stretches had a measurable effect on the passive properties of the hamstring muscle-tendon unit, in vivo. Methods: Resistance to stretch was defined as the passive moment (Nm) offered by the hamstring muscle group during passive knee extension using a KinCom dynamometer as previously described (Kinetic Communicator, Chattecx Corp., Chattanooga, TN). The static stretch exercise was administered to the left lower extremity of all subjects and consisted of a dynamic phase of passive knee extension to a predetermined final joint angle followed by a 45-s static phase. The procedure was repeated for a total of three 45-s static stretches with 30-s rest period between stretches. Results: There was a significant decline in resistance over the 45-s the static phase in stretch 1 (20+/-3%) and stretch 3 (18+/-3%), P<0.001. Further, the absolute or relative decline in resistance over time stretch 1 and 3 were equivalent. The mean resistance in stretch 1 and 3, expressed as the log(e) of time, yielded an equal and highly linear relationship (r**2 = 0.96+/-0.01); the slope and intercept did not differ. In the dynamic phase of the stretch, the energy of stretch 1 and 3 were similar. Conclusions: These data suggest that the static stretching protocol used in the present study had no short-term effect on the viscoelastic properties of human hamstring muscle group. Verf.-Referat