SHARP: Study on Hamstring Reinjury Prevention

Hamstring injury has a high re-injury rate in football players. Re-injuries primarily occur during the first weeks after Return to Play (RTP) and are commonly more severe than the initial injury. Previous studies showed that the Nordic Hamstring Exercise (NHE) effectively prevents primary hamstring injury. No study investigated the secondary preventing effect of NHE on re-injury after RTP following hamstring injury.


The primary purpose of this study is to investigate the effectiveness of the Nordic Hamstring Exercise for preventing hamstring re-injury after RTP following hamstring injury in football players. The secondary purpose is to determine the effect of the Nordic Hamstring Exercise on sprint and jumping performance among the subjects.


We will involve 368 male or female football players aged 18-40 years and within one week of return to play after a hamstring injury to participate in this study. The subject will be randomised into a Nordics or control group. The subjects in both groups continue their regular football training, but the Nordics group will perform an additional Nordic Hamstring Exercise program. An online questionnaire to monitor hamstring re-injury, adherence, exposures, and self-initiated prevention program was sent to the subject in both groups during the 12 months follow-up period. The selected subjects will complete a sprint and jumping performance test three times, at the beginning of the study (pre-test), after ten weeks of intervention (post-test 1), and after 12 months (post-test 2).

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©2015 Amsterdam Institute of Sport Science (AISS)
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