TY  - JOUR
AU  - Eisuke, Ochi
A2  - Eisuke, Ochi
A2  - Naokata, Ishii
A2  - Koichi, Nakazato
DB  - BISp
DP  - BISp
KW  - Gelenkbeweglichkeit
KW  - Muskelkontraktion, exzentrische
KW  - Muskelphysiologie
KW  - Muskelspannung
KW  - Muskeltonus
KW  - Muskeluntersuchung
KW  - Sprunggelenk
KW  - Tierversuch
KW  - Untersuchung, empirische
KW  - Übungswirkung
LA  - eng
TI  - Effects of acute eccentric contractions on rat ankle joint stiffness
TT  - Auswirkungen akuter exzentrischer Kontraktionen auf die Sprunggelenkssteifigkeit bei Ratten
PY  - 2007
N2  - The sensation of joint stiffness is frequently observed after eccentric contractions (ECs) in human, but the joint stiffness of animals after ECs has not been examined previously. This study tested whether a bout of ECs affects rat ankle joint stiffness. We also evaluate muscle passive tension in the rat hindlimb to examine the relationships of ankle joint stiffness with muscle passive tension. Anesthetized male Wistar rats (n = 23) were firmly secured on a platform in the prone position. A bout of ECs was performed on the gastrocnemius muscle with a combination of electrically induced tetanic contractions via a skin electrode and simultaneous forced dorsiflexion of the ankle joint (velocity, 15°/s; from 0°to 45°). Passive resistive torque (PRT) of the ankle joint was measured to evaluate joint stiffness. Passive tension of the exposed gastrocnemius muscle was also measured when the maximum value of joint stiffness was obtained. The PRT on days 2, 3, and 4 was significantly higher than the pre-treatment value (days 2 and 4; p < 0.001, days 3; p < 0.01). The passive tension on day 4 was significantly higher than that of the sham-operated group. The muscle wet mass was identical in both groups, suggesting the absence of edema. We conclude PRT increases after ECs in rat ankle joint. We also show the possibility that it is associated with muscle passive tension, independent of edema formation. Verf.-Referat
L2  - http://www.jssm.org/vol6/n4/23/v6n4-23text.php
SP  - S. 543-548
SN  - 1303-2968
JO  - Journal of sports science and medicine
IS  - 4
VL  - 6
M3  - Elektronische Ressource (online)
M3  - Gedruckte Ressource
ID  - PU201002002509
ER  -