Įccentric knee flexor strength is commonly measured using an isokinetic dynamometer, which is considered to be a gold standard. Since the knee flexors perform eccentric contractions to absorb force in knee extension movements to decelerate the momentum during the late swing phase in sprinting, hamstring strength, especially in eccentric contractions, is important to prevent its strain injuries. However, it does not appear that the number of hamstring strain injuries has decreased significantly in the last 10 years. The etiology of the hamstring strain injuries has been investigated in many studies, and risk factors and prevention strategies have been documented. Hamstring strain injuries are common in sports, consisting of 12–15% of all injuries. It may be that other factors than static and dynamic hamstring strengths affect Nordic hamstring strength. These results show that Nordic hamstring strength is not associated with the knee flexor torque measured by an isokinetic dynamometer. This was also the case for the Nordic hamstring torque and MVC torque of isometric (r = −0.03–0.1, p = 0.71–0.92) and concentric contractions (r = 0.28–0.49, p = 0.053–0.29). No significant correlations were evident between the peak Nordic hamstring torque and peak eccentric knee flexion torque (r = 0.24–0.3, p = 0.26–0.4). Peak Nordic hamstring torque ranged 96.8–163.5 Nm, and peak MVC eccentric torque ranged 50.7–109.4 Nm at 30°/s and 59.2–121.2 Nm at 60°/s. Correlations among the dependent variables were assessed using Pearson’s correlation coefficients. MVC torque of the knee flexors was measured isometrically at 30°, 45°, 60°, and 90° knee flexion joint angles, and concentrically and eccentrically at 30°/s and 60°/s in 10°–90° knee flexion for the dominant leg in a prone position.

The force was multiplied by lower leg length and converted into torque. In Nordic hamstring, each participant was instructed to lean forward as far as possible in 3 s (approximately 30°/s), and force at the ankle joint of the dominant leg was measured during the movement. Sixteen healthy young men who had not experienced hamstring strain injuries participated in the study. We investigated the relationship between Nordic hamstring strength and maximal voluntary contraction (MVC) torque of the knee flexors measured by an isokinetic dynamometer. However, what exactly Nordic hamstring strength indicates is not clear. Nordic hamstring exercise is performed to prevent knee flexor muscle strain injuries and used to assess their injury risks.

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