relationship between core stability and lower extremity function in female athletes

Core stability is the ability of the lumbopelvic- hip complex to prevent buckling of the vertebral column and return it to equilibrium following perturbation. It has been demonstrated that trunk muscle activity occurs before the activity of the prime mover of the limb. Core stability is seen as being pivotal for efficient biomechanical function to maximize force generation and minimize joint loads in all types of activities ranging from running to throwing. The aim of this study was to examine the correlation between core stability and lower extremity function in female athletes. Thirty volunteer female athletes with mean age [SD]=23[3.8] years old, participated in this study. They performed two series of tests: core stability tests [hip isometric abduction and lateral rotation, double leg lowering, trunk extension - flexion and left and right lateral flexion endurance, and double leg lowering], and lower extremity function tests [star excursion balance tests in three directions, vertical jump, single and triple hopping, stairs sprinting, 6 m hopping, and shuttle run]. The results of this study showed that the strength of hip isometric abduction with stairs] sprinting, 6 m hopping, and with star excursion balance test in three directions had r=-0.430, r=-0.367 and r=0.515 respectively and all significant. Also, right lateral flexion endurance with shuttle run [r=0.367], double leg lowering with vertical jump [r=0.42], trunk extension endurance with vertical jump [r=-0.404], were significantly correlated. In the other items there were no relationship between core stability and lower extremity function [p>0.05]. There is a relationship between core stability and lower extremity function but studies have not supported them. However, the data showed that core stability is moderately too weak related to lower extremity function, core stability could not be measured with these tests and they are not good indicators for lower extremity function. Evaluation of the core should be dynamic, and compromise assessment of the specific functions which specialize for athletic groups

Prevalence of professional damage in cashiers employee at Tehran's goods sales centers

Forces imposed on body members even on light working condition, may gradually result in damages caused by working. Persons engaged at goods sales centers including cashiers, may be to catch exhaustion and neuromuscular damage due to repetition of their wrist, elbow and shoulder joints movement. The aim of this research is to assess the relation between the work factors and personal characteristic in possibility of the above symptoms. The questioners form propounded at Stanford university question were asked and coded based on the target group, and having been reviewed and surveyed were later used in this research. This questioner included parts such as recording the personal characteristics, history of illnesses, clinical diagnosis and evaluation of the work environment and the hand tools. Selected individuals were randomly employed at goods sales centers from five geographical districts of Tehran. The most complaint of employees was pain and dysfunction in upper limbs, neck and shoulder. Half of subjects had carpal tunnel syndrome. Length of work time and employment duration at sales centers increase probability of neck and shoulder pain. The profession of cashiering at sales centers is one of the most stress causing jobs on the peripheral joints of upper limb, so that the lengths of working in this position and the amount of activity have a positive effect on the increase of neuromuscular disorder. Apply of correct pattern of using the tools and the equipment in this work environment could substantially control the negative effects of this type of job. The most of complains expressed by individuals taking part in this research have been related to sign and symptoms of involvement of median nerve in the wrist and referral pain in the neck, shoulder and arm