Recently in the Journal of Electromyography and Kinesiology a group of scientists looked at electromyographical activity of the knee flexors in previously strained hamstrings of recreational athletes that had returned to normal activity. They compared their results against their contralateral leg, as well as looked at comparisons of a population of athletes that had never been injured. The research group found the knee flexors on athletes with a history of a previously injured limb were weaker at all contraction speeds tested.
Many recreational athletes return to activity with very little supervised rehabilitation and the results could be expected. Even though the athlete may feel great and function at their normal level they may never return to normalcy again. Based on the aforementioned information it is clear all injured need strength training.
As a coach it is important to periodically test your athletes hamstring strength, this is not just for the athlete that has been previously injured. Ankle sprains, thigh bruises, hip injuries can all lead to disuse in a limb. Our bodies have miraculous ways to compensate. An athlete may perform well but have a strength deficit. Assume nothing.
The absolute best tool for testing and/or strength training the hamstring is the Pendulum leg curl Get and keep Strong.
