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219 The effectiveness of a judo-specific injury prevention programme: a randomized controlled trial
  1. Amber von Gerhardt,
  2. Guustaaf Reurink,
  3. Gino Kerkhoffs,
  4. Evert Verhagen,
  5. Kai Krabben,
  6. Jeroen Mooren,
  7. Jessica Gal,
  8. Arnold Brons,
  9. Ronald Joorse,
  10. Benny van den Broek,
  11. Ellen Kemler,
  12. Johannes L Tol
  1. Amsterdam Collaboration on Health and Safety in Sports (ACHSS), Amsterdam UMC IOC Research Center of Excellence, Amsterdam, Netherlands


Background Despite the relative high injury prevalence in recreational judo athletes, there is an absence of evidence-based prevention programmes in judo.

Objective To evaluate the effectiveness of a trainer-supervised judo-specific injury prevention warm-up programme (Injury Prevention and Performance Optimization Netherlands (IPPON) intervention) on the overall injury prevalence compared to usual warm-up in judo athletes.

Design Two-arm, cluster randomized controlled trial.

Setting Judo athletes were randomised per judo school-cluster in a group performing the trainer-supervised IPPON intervention (IPPON group) or a group performing the warm-up and practice as usual (control group).

Participants The main inclusion criterion was ≥12 years of age. 269 judo athletes (117 IPPON group and 152 control group) were included for analysis.

Intervention IPPON intervention with 16 to 26 weeks of follow-up.

Main Outcome Measurements The primary outcome was the overall injury prevalence (%) measured every fortnight with the online Oslo Sports and Trauma Research Centre questionnaire. Secondary outcome scores included prevalence of substantial injuries, overall incidence, time-loss injuries, exposure, adherence and experiences.

Results The mean injury prevalence was 23% (95% CI 20–26) in the IPPON group and 28% in the control group (95% CI 25–30). The risk of reporting injuries was 18% lower in the IPPON group (OR 0.72 95% CI 0.37–1.39, adjusted p-value of 0.33). Secondary outcome scores showed no differences between groups. For substantial injuries there was a 22% lower risk in the IPPON group (OR 0.80, 95% CI 0.36–1.78, adjusted p-value 0.58). Trainers and athletes experienced the IPPON intervention as successful.

Conclusions The IPPON trainer-supervised judo-specific injury prevention programme did not reach statistical significance in reducing the overall injury prevalence. The best-estimate of 18% injury reduction rate and successful experience indicate that the IPPON intervention might be practicable and relevant for the judo community.

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