International Journal of Physical Medicine & Rehabilitation
Open Access

How does the eccentric contraction in functional ankle instability among male student Soccer players?

4^th International Conference on Physical Medicine and Rehabilitation

August 24-26, 2016 Philadelphia, USA

Mehdi Kasbparast Jui Ray and Amir Abass Raei

Azad University, Iran

Scientific Tracks Abstracts: Int J Phys Med Rehabil

Abstract :

During everyday activities, concentricactions start movements while eccentricactions slow activity down. For example,during running, the quadricep muscles willpropel the runner forward with concentricactions, while the hamstrings can brakerunning by slowing down the forwardmotion. To maintain sport performance andprevent injury throughout the whole range ofmotion, strengthening both phases ofmuscle contraction is important. Isokinetic invertor and evertor torques were assessed eccentrically and concentrically at speeds of 60 and 120 degrees �s (-1) in 16 subjects with unilateral ankle instability. Absolute peak torque values were compared between the injured and non-injured limbs to determine whether strength deficits existed. No eccentric or concentric evertor strength deficit was found in the injured limb. Interestingly, for the injured limb, a significant interaction effect was found whereby eccentric inversion strength was reduced. Functional ankle instability is notassociated with deficits in evertor strength. Deficits in eccentric invertor strength were found, and this may contribute to the symptoms of functional ankle instability. Weak invertors may contribute to functional ankle instability because of a reduced ability to assist in controlling lateral displacement of the shank over the weight bearing foot. Excess lateral postural sway outside of the base of support results in the foot�s medial border rising from the floor once the limits of closed chain eversion is reached, which may result in the foot being forced into rapid inversion.

Biography :

Mehdi Kasbparast Jui Ray is faculty member of Physical Education and Sport Sciences, Karaj branch, Islamic Azad University, Karaj and he is doctoral student in sport injury and member of Asian Society for physical Education and Sport for 15 years.

Email: mehdikasbparast@gmail.com