Background: An injury of posterior thigh muscles in sport is a significant problem, which is associated with significant economic costs and high demand for sport rehabilitation. Exercise for eccentric muscle strength of the posterior thigh muscles plays an important role in prevention. Objective: The main goal of our study is to compare eccentric muscle strength of the posterior thigh muscles in elite hockey playersand elite football players, and also to identify the risk of injury in both groups. Methods: NordBord Hamstring Testing System is an equipment designed to measure eccentric and isometric strength of hamstrings. Nordbord's main focus is on the eccentric muscle strength in exercise which is called Nordic Hamstring. Sample: Our sample included professional hockey players (n = 30) and professional footballers (n = 30). The average age of hockey players was 26.3 years. The minimum age was 19 years and the maximum age was 37. The average BMI was 26. The average age in the football team was 25 years. The minimum age was 18 years and the maximum age was 38. The average BMI was 23. Results: Mean values of eccentric muscle strength in hockey players were 419.8 N (SD ± 65.4) on the left posterior thigh muscle and 420.9 N (SD ± 58.2) on the right posterior thigh muscle. In footballers, the average values of eccentric muscle strength were as follows: left posterior thigh muscle 419.6 N (SD ± 44.7), right posterior thigh muscle 428.6 N (SD ± 49.8). The statistical significance was compared between the eccentric hamstrings muscle strength of the hockey players and the football players. There was no statistically significant difference between the groups tested. Conclusion: The difference of eccentric hamstrings muscle strength between football players and hockey players was not significant. A high risk of hamstring injury was seen in eight football players and six hockey players.
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