شیما بختیاری خو

The aim of this study was to evaluate the relationship between lower extremity alignment and endurance of core with maximal knee valgus during drop landing jump in female athletes. In the present cross-sectional study, 44 female athletes aged 16 to 26 years participated. The knee valgus angle was recorded using video camera during landing jump. Q angle, navicular drop, hip anteversion, tibia torsion, knee hyperextension and core stability endurance were assessed using standard clinical procedures. Data were analyzed by Pearson correlation test. The findings of the present study showed that there is a significant relationship between Q angle, endurance of right and left lateral flexor muscles with maximum knee valgus (P≤0.05). According to results of this study, assessing the Q angle and endurance of the lateral flexor muscles of the trunk can help identify athletes at risk for ACL injury and provide programs for the prevention of lower extremity injuries.

The current study aimed comparison functional tests scores in football players with and without chronic ankle instability. 26 athletes with CAI and 26 healthy athletes selected as sample. The Y test was used to assess balance, the McGill test for core stability, the landing error scoring system to assess landing mechanics, the single-leg timed hop to evaluate performance, and the tuck jumps to identify neuromuscular defects. Multivariate analysis of variance was used to analyze the data. The results of showed that there was a significant difference between the single-leg timed hop test, trunk extensor muscle endurance, trunk flexor muscle endurance, there is a posteromedial balance and a posterolateral balance between the two groups (P≤0.05). With respect to the results of the present study, it is recommended to coaches use filed based tests to identify functional defects in athletes with chronic ankle instability to design prevention and rehabilitation programs.

The core muscles of trunk are activated before movements of upper and lower limbs. Current evidence suggests that lose of stability in core region predisposes to second injury and appropriate exercise may reduce the risk of reinjury. This aim of this study was to evaluate the effect of eight weeks core stability exercises on dynamic balance, function and strength in athletes. after anterior cruciate ligament reconstruction.

This study was a randomized clinical trial. 26 athletes with a history of anterior cruciate ligament reconstruction were purposefully selected and randomly divided into experimental and control groups.the experimental group performed core stability exercises for eight weeks and the control group performed their daily exercises. Dynamic balance, isometric strength and function were meaured using Y balance test, hand held dynamometer and hop tests. Data were analyzed using SPSS vrsion16 software. Independent t-test was used to compare demographic characteristics and Mixed Repeated Measures ANOVA was used to compare the means of the two groups (p≤.05).

The results of the present study showed significant improvement in dynamic balance (F=143.92, P=0.000), single-leg hop (F=68.25, P=0.000), triple hop (F=14.02, P= 0.001), knee flexor strength (F=50.21, P=0.000) and knee extensor strength (F=54.72, P=0.000) in the experimental group after eight weeks of core stability exercises.

Based on the results of present study, it is suggested to the specialists and trainers involed in the rehabilitation of athletes to use comprehensive and useful core stabilization exercises in the rehabilitation stages of knee injuries.