الفهرس 
Title : Efficacy of adding post-training nordicexercises to hamstring injury prevention program in soccer players
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Abstract
Background: Hamstring injuries represent about 50% of non-contact football muscle injuries internationally, with recurrence rate 12{u2013}33%, even with preventive procedures. Purpose: to investigate the effect of Nordic Exercise post training for the hamstring initial, recurrent, and severity of hamstring injury, under supervision and with high compliance. Subjects & methods: In this Randomly Controlled trial study, 34 professional football players were randomly assigned into two groups, 17 players in each, with age ranged 21-35 years old. group I (Interventional): subjects performed pre and post training Nordic Hamstring Exercise (NHE) while in group II (Control) they performed only the pre training NHE. The duration of therapeutic intervention in both groups was 12 weeks. Evaluation: Australian Football association injury Form was used to collect the injuries incidence for each subjects in both groups. Results: at the end of the therapeutic intervention, the mean of total risk time was 116.3±13.2 and 117.6±5.7 exposure hours for group I and II respectively, the interventional group showed reduction in the total number of injuries by 92.3% than last season, while in control group it was 77% less than last season. Conclusion: Both applying the protocols as pre and post NHE and pre-training NH only were effective in reducing the initial, recurrent and severity of hamstring injury rates in professional football players, but the pre and post NH were more effective