What is it about?

After a six-week period of eccentric isotonic training, the hamstring eccentric peak torque and flexibility of trained and untrained groups improved without changes in the concentric peak torque. Moreover, the improvement of untrained subjects was higher than trained subjects. These findings may be helpful in designing the hamstring rehabilitation program.

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Why is it important?

To the best of our knowledge, although previous studies have reported that eccentric training increases muscle strength, decreases injury rates, increases flexibility, and improves athletic performance, no studies have been performed to compare the effects of eccentric isotonic training on the isokinetic strength profile of the hamstring muscles in trained and untrained subjects. Therefore, this study was conducted to compare the effects of eccentric isotonic training on the hamstring concentric and eccentric peak torque and hamstring flexibility between trained and untrained subjects.


Eccentric training improved hamstring flexibility and eccentric torque in both trained and untrained subjects without improvement in the concentric torque. The improvement in the hamstring eccentric torque and flexibility of the untrained group was higher than the trained group. So, incorporating eccentric training in a hamstring rehabilitation program may increase eccentric strength and flexibility and reduce potential hamstring injuries.

Prof. Dr. Amr Almaz Abdel-aziem
Faculty of Physical Therapy, Cairo University

Read the Original

This page is a summary of: Isokinetic peak torque and flexibility changes of the hamstring muscles after eccentric training: Trained versus untrained subjects, Acta Orthopaedica et Traumatologica Turcica, July 2018, Elsevier,
DOI: 10.1016/j.aott.2018.05.003.
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