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Correlation between isokinetic profile and knee injuries in male volleyball athletes
  1. L D Mendonça,
  2. N F N Bittencourt,
  3. R A Barreto,
  4. T F Paiva,
  5. R F Porto,
  6. A A Silva,
  7. S T Fonseca
  1. Laboratory of Prevention and Rehabilitation of Sports Injuries (LAPREV), Federal University of Minas Gerais, Belo Horizonte, Brazil


Background Knee injuries are prevalent in elite volleyball and their preventive management is still discussed. Isokinetic assessment is largely use in sports injury prevention; however few studies investigate the differences in the isokinetic profile of injured knees. These studies analyses the agonist/antagonist ratio and do not consider other parameters as fatigue index.

Objective to investigate the differences between injured and non injured knee in the hamstring/quadriceps ratio and fatigue index in volleyball male athletes.

Setting all testing took place in the Sports Injury Prevention and Rehabilitation Laboratory- LAPREV in elite volleyball.

Participants 49 male (mean+SD age, 21.96+4.1; height, 196.5+0.06; body mass, 89.1+9.03) athletes were evaluated in this study, being 20 at injured group. Participants with lower-extremity surgery in the previous 6 months and pain during the isokinetic test were excluded.

Assessment of risk factor: hamstring/quadriceps ratio at 60°/s and 300°/s and fatigue at 300°/s at the dominant knee with 90° of hip flexion.

Main outcome measurements trauma and overuse knee injuries provided by questionnaire.

Results Differences between groups were found just in hamstring fatigue (p=0.002). The means of this parameter were 63.1 and 55.6 for injured and non-injured group respectively. For quadriceps fatigue the means were 48.4 and 47.3 respectively. No differences were found in the ratio analysis between groups (p=0.403 for 60°/s and p=0.289 for 360°/s). The means were 199.4 and 203.5 for injured and non-injured groups at 60°/s and 157.4 and 168.6 respectively at 300°/s.

Conclusion The results showed that the injured group has more hamstring fatigue compared to non-injured group. The ratio analysis does not reveal differences between groups. The fatigue analysis must be incorporated in the athlete's assessment, because seems to be more informative about injury risk.

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