Affiliations: [a] G.R.H.A.L., Faculty of Sport Sciences and Faculty of
Medicine, University of Rouen, France | [b] C.E.T.A.P.S., Faculty of Sport Sciences, University of
Rouen, France
Note: [] Faculté des Sciences du Sport et de l'Education Physique,
Université de Rouen, Boulevard Siegfried, 76821 Mont Saint Aignan Cedex,
France. Tel.: +1 33 2 35 14 81 62; Fax: +1 33 2 35 14 81 70; E-mail:
[email protected]
Abstract: The aim of our study was to compare the isokinetic concentric
(60\ci.s^{-1}, 120\ci.s^{-1},
240\ci.s^{-1}) and eccentric
(60\ci.s^{-1}, 120\ci.s^{-1}) strength
bilaterally of the knee muscle of soccer players in relationship to their
position on the playing field. The hamstrings and quadriceps strength of 21
soccer players were evaluated with a Kin-Com\textregistered(Kinetic
Communicator) isokinetic dynamometer. A predominance of the strength moments on
the dominant leg compared to the non-dominant leg was not demonstrated, except
for the hamstrings in a concentric mode at a 240\ci.s^{-1}
speed. Both the concentric and eccentric strengths of the knee flexors and
extensors decreased with the increase in angular speed. The relationship
between the three positions in the game (forward, midfield, and defender) and
the isokinetic strengths measured at different speeds underlined specific
differences between each position. These differences were observed at the level
of the co-activation of the knee flexors and extensors during the movements
specific to the position and between the kicking leg and the stance leg.
