NDLI: Effects of stretching velocity on passive resistance developed by the knee musculo-articular complex: contributions of frictional and viscoelastic behaviours

Content Provider	Springer Nature Link
Author	rdez, A. Casari, P. Cornu, C.
Copyright Year	2008
Abstract	It is commonly accepted that the passive musculo-articular complex (MAC) displays a viscoelastic behavior. However, the viscosity of the MAC is still not well understood when considering the relationship between the passive resistance offered by the MAC and the stretching velocity. Therefore, in order to obtain a better knowledge of the mechanical behavior of the passive MAC, nine subjects performed passive knee extension/flexion cycles with the hip angle set at 60° on a Biodex® dynamometer at 5°, 30°, 60°, 90° and 120° s−1 in a randomized order to 80% of their maximal range of motion. Results show significant (P < 0.001) increases with the stretching velocity for the passive torque (between +17.6 and +20.8% depending on the considered knee angle), the potential elastic energy stored during the loading (E: +22.7%), and the dissipation coefficient (DC: +22.8%). These results suggest that the role of viscosity in the MAC’s mechanical behavior is limited. A linear model was well-fitted on torque-velocity (0.93 < R 2 < 0.98), E-velocity (R 2 = 0.93) and DC-velocity (R 2 = 0.99) relationships. The linear relationship between DC and velocity indicates that the DC does not tend towards zero for the slowest velocities and that the dissipative properties of the MAC could be modeled by combining linear viscosity and friction. The present study would allow the implementation of a rheological model to simulate the behavior of the passive MAC.
Starting Page	243
Ending Page	250
Page Count	8
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	103
Issue Number	2
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-02-23
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Passive torque Dissipative properties Viscosity Friction Elasticity Sports Medicine Occupational Medicine/Industrial Medicine Human Physiology
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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