Semitendinosus and biceps femoris long head active stiffness response until failure in professional footballers with vs. without previous hamstring injury.

This study sought to examine the active stiffness of semitendinosus (ST) and biceps femoris long head (BFlh) during a knee flexor isometric contraction at 20% of maximal voluntary isometric contraction until failure in elite footballers ( = 50, age: 22.3 ± 5.3 years; height: 1.