TY - JOUR ID - 62873 TI - A Comparison of Range of Motion of Joints and Isometric Strength of Lower Extremity Muscles in Female Athletes with and without Dynamic Knee Valgus JO - Sport Sciences and Health Research JA - SSHR LA - en SN - AU - shahheidari, sareh AU - norasteh, ali asghar AU - daneshmandi, hasan AD - PhD Student of Corrective Exercises, Faculty of Physical Education and Sport Sciences, University of Guilan, Rasht, Iran AD - Professor, Faculty of Physical Education and Sport Sciences, University of Guilan, Rasht, Iran AD - Associate Professor, Faculty of Physical Education and Sport Sciences, University of Guilan, Rasht, Iran Y1 - 2017 PY - 2017 VL - 9 IS - 1 SP - 83 EP - 101 KW - dynamic knee valgus KW - Lower Extremity KW - muscle strength KW - range of motion DO - 10.22059/jsmed.2017.62873 N2 -   The aim of this study was to compare isometric strength and range of motion (ROM) of lower extremity in female athletes with and without dynamic knee valgus. 48 healthy female athletes (age range 15-18 years) in two groups: those with dynamic knee valgus during squat movement that was corrected by a heel lift (n=24) and those with no dynamic knee valgus (n=24 as the control group) with no injury in the past participated in this study. Maximum isometric strength was measured in kilograms using a hand-held dynamometer and active ROM was measured in degrees with a standard plastic goniometer. Independent t test and MANOVA were used to analyze data (P≤0.05). The results showed that the group with dynamic knee valgus had significantly lower mean ankle dorsiflexion ROM (with right knee) (F1.46=5.503, P=0.023) and isometric strength of ankle plantar flexion (F1.46=4.187, P=0.046) than the control group. No other significant differences were observed between the groups. The subjects with dynamic knee valgus exhibited tight and weak lateral and medial gastrocnemius muscles. This result indicated that decreased ankle dorsiflexion ROM as a factor affecting the alteration of movement pattern of lower extremity and consequently a risk factor for knee injuries must receive the attention of clinicians and trainers. UR - https://sshr.ut.ac.ir/article_62873.html L1 - https://sshr.ut.ac.ir/article_62873_0d48283adf480f08a1e302b029a434c9.pdf ER -