بررسي تاثير خستگي موضعي عضلات ديستال وپروگزيمال در صفحه ساژيتال اندام تحتاني بر ميزان وابستگي به بينايي در ثبات پاسچر زنان جوان سالم

The Effect ofLocal Fatigue Induced at Proximal and Distal Muscles ofLower Extremity in Sagittal Plane on Visual Dependency in Quiet Standing Postural Stability of Healthy Young Females

Objective: The purp ose of the prese nt study was to assess the effect of local muscle fati gue induced at proximal and distal segments of lower extr emit y on sagitt al plane mover on visual depend ency in qui et standing postur al stabil ity. Materials & Methods: In thi s Quasi - experimental study (before after compariso n) sagittal plane prime mover s of the ankle and hip musculature were fa tigued using isokinetic co ntrac tions at two test sess ions wi th a rand omi zed ord er and one week interval. Twent y five health y yo ung female students wer e se lec ted by using non probability selec tio n and sample of con venience and asked to maintain single leg upri ght posture as immobile as possibl e. RMS and SD of Ce nte r of Pressure displ acements were assessed in 30 seconds and co nse quently, the eyes we re clo sed aft er 15 seco nds . A analysis of variance (ANOVA) for repeated measures was used to analyze the effect of the following fact or s over two periods of 5 seco nds immediately before and afte r eye closure: ( I ) fatigue , (2) vision, (3) segment of fatigue. Results: Th e main effec ts of each within-su bject factors (fat igue, visio n and segment of fatigue ) were significant (P<0.05 ). The analysis of RMS and SD of Center of Pressure demon strated a significant interaction between fatigu e and vision, and fatigue and segment of fatigue so that the effec ts of Fatigue on Proxim al segment and eye clo sed conditions we re incre ased . Conclusion: The vis ua l dep end ency for co ntro l o f postural s tability increment ed followin g muscle fatigue. Pro xim al muscle fatigue lead to exagg eration of visual dependency for co ntro l of postu ral stability. Based on the pr esent re sults, emphas is on the proprioc epti on of proximal segment of lower extremity may be recommended for postur al stability training.