Introduction: Ankle sprains are one of the most common sports injuries. This injury can affect the kinematics of the athletechr('39')s lower extremities. Therefore, the aim of this study was to compare the effect of 6 weeks of balancing and hopping strengthening training on the kinematics of the lower extremities of athletes with functional ankle instability while running. Methods: The present...

 In this paper, we study the electronic conductance and density of states for a comb-like polymer with periodic hopping energies in the tight-binding approach. Electron transmission coefficient and density of states are analytically calculated by using Green’s function of the system. The results show that the electronic conductance spectrum has one energy gap in the absence of carbon-hydrogen b...

In this paper, we studied the electronic conductance of a polypyrrole polymer, which is embedded between two semi-infinite simple chains by using Green’s function technique in tight-binding approach. We first reduced the center polymer to a one dimensional chain with renormalized onsite and hopping energies by renormalization method. Then, we calculated the system conductivity as a function of ...

In this paper, we study the electronic conductance of molecular nanowires by considering the electron hopping between the first and second neighbors with the help Green’s function method at the tight-binding approach. We investigate three types of structures including linear uniform and periodic chains as well as poly(p-phenylene) molecule which are embedded between two semi-infinite metallic l...

Purpose: This study aimed to compare the effect of 4 weeks of suspension exercises with TRX and hopping on the static and dynamic balance of male college athletes. Methods: This was a quasi-experimental study. In total, 36 male volleyball, basketball, soccer and handball players of the University of Tehran with an age range between 20 and 28 years were selected purposefully and then randomly a...

Chronic ankle instability has defined as recurrent ankle sprain, so that 40% of injured athletes after acute injury despite of receiving of adequate rehabilitation, suffering from this instability. The purpose of this study is investigate of postural sway’s risk factors proportion in jump-landing and lateral hopping tasks, in prediction of chronic ankle sprain occurrence. 25 ankle sprain injure...