چکیده:
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.
خلاصه ماشینی:
Assistant Professor, Faculty of Physical Education and Sports Sciences, Gilan University, Rasht, Iran Abstract The aim of this study was to compare the isometric strength of muscles and the range of motion of the lower limbs in female athletes with and without dynamic knee valgus.
Single-leg jump-cut Some researchers, in addition to muscle strength, have also investigated the relationship between joint range of motion and knee movement in the frontal plane, but contradictory results have also been reported in this area.
Malloy The purpose of this study was to compare range of motion indices and isometric strength of lower limb muscles in 15-18 year old female athletes with and without dynamic knee valgus.
To ensure knee extension, a foam roller was placed under the distal end of the lower leg, and the subject was asked to perform maximum plantar flexion and dorsiflexion while maintaining a neutral 2 subtalar position (do not allow the foot to invert or evert) (the end of the dorsiflexion range is where further movement causes excessive stretching in the back of the calf and bending of the knee) (21).
Therefore, considering that the subjects of the present study were also selected using this method and the main cause of their dynamic knee valgus was muscle imbalance in the leg muscles, these results are justifiable that no significant difference was observed in comparing the strength of the hip muscles and its range of motion in the two groups.
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