Int J Sports Med 1988; 09(6): 448-450
DOI: 10.1055/s-2007-1025049
© Georg Thieme Verlag Stuttgart · New York

Isokinetic Investigation of Knee Extensors and Knee Flexors in Young French Soccer Players

P. Rochcongar, R. Morvan, J. Jan, J. Dassonville, J. Beillot
  • Consultation des Médecine du Sport, Service Explorations Fonctionnelles (Pr LE BARS) - Hôpital Pontchaillon, Rue Henri Le Guillou, Rennes (France)
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Publication History

Publication Date:
14 March 2008 (online)


The knee extensor and knee flexor muscle groups in three groups of young soccer players were tested with a Cybex II isokinetic dynamometer and compared with adults. Muscle strength increased with age. The largest gain was observed in young players aged 16-17 years whose quadriceps was the most modified muslce group giving the lowest H/Q ratio.

Analysis of the regression equations obtained for torque values at 30°s-1 and 180°s-1 revealed that there were two distinct groups : under 16 and over 16. After reaching 16 years of age, the increase in muslce strength is greater at low velocity than at high velocity.