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  1. M Grygorowicz1,2,
  2. R Hojszyk1,
  3. T Piontek1,3,
  4. W Dudzinski1
  1. 1Rehasport Clinic, Poznan, Poland, Poznan, Poland
  2. 2Department of Physiotherapy, Institute of Health Protection, Stanislaw Staszic State School of Higher Vocational Education in Pila, Pila, Poland
  3. 3Department of Pediatric Orthopedic Surgery, Poznan University of Medical Sciences, Poznan, Poland,


Background However the isokinetic strength is well described in the literature, there is still little know about the relative isokinetic strength values in sub-elite and elite soccer players of both sexes. One has to remember that this value should be regarded as one of critical sport-return criteria in case of the injury.

Objective To describe distribution of isokinetic relative strength value in Polish elite female and male soccer players. We hypothesize that there will be no differences in relative isokinetic strength between players in different soccer level group.

Design Cross sectional study.

Setting Elite and sub-elite division.

Participants 41 young sub-elite (YSMS), 27 elite male (EMS) and 30 elite female soccer (EFS) players from Polish Ekstraklasa and Youth Division.

Interventions All soccer players performed concentric-concentric knee extension-flexion movements on Biodex System 3 Pro dynamometer at 60°/s of angular isokinetic velocity. Alignment axis of dynamometer rotation, thigh, hip and trunk stabilization as well as gravity correction and the range of motion was then set for each participant according to standard procedures. Values of relative isokinetic strength for were recorded. The one-way ANOVA with post hoc Tukey T test were used to assess differences between three groups. t-Test for two independent samples was used to analyze gender effects. Statistical significance was set at P<.05.

Main outcomes measurements Relative knee extensors and flexors isokinetic strength (Nm/kg).

Results EFS had significantly higher results in isokinetic quadriceps and hamstring strength comparing to YSMS (2.64 vs. 2.31; P<.001 and 1.39 vs. 1.27; P=.0207, respectively) and significantly lower results comparing EMS group (2.64 vs. 3.11; P<.0001 and 1.39 vs. 1.78; P<.0001, respectively). However there were no differences between groups regarding sex (P=.8881 for extension and P=.0839 for flexion).

Conclusions Observed differences may be related to soccer skill level and not gender.

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