Aims: To investigate the type and severity of injury sustained during judo competitions, and to investigate any possible correlation between injury rate and gender, grade, weight category and rapid weight loss. Method: Three hundred and ninety-two judokas (284 males, 108 females) competed in three consecutive competitions. A judoka was "injured" if they requested medical treatment or could not continue. Following injury, a questionnaire was completed. Uninjured judokas were asked to complete a questionnaire at one competition to assess risk factors of injury. Follow-up was conducted 6 weeks after each competition. Results: Fifty-three out of 392 judokas (13.5%) (40 males, 13 females) sustained an injury. No difference was found between injury rates among males (41.3/1000 anthlete-exposures (A-E's)) and females (40.9/1000 A-E's), or between judokas of different weight groups or grades. Rapid weight loss of 5% or more of a judoka's body weight placed the athlete at a higher risk of injury (P=0.022). Most injuries affected the upper extremities. Injuries most often resulted from grip fighting, being thrown, or attempting to throw. Conclusions: Judokas are advised not to lose weight before a competition as this increases the risk of injury. Neither grade, nor gender, or weight category are associated with an increase in injury rate.
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