effects of 6-week corrective-plyometric training with and without visual feedback on lower extremity Biomechanics and dynamic balance in junior female athletes with dynamic knee valgus

comparing the effects of corrective-plyometric exercises with and without visual feedback on landing biomechanics and dynamic balance in female athletes with dynamic knee valgus

Two arm parallel group randomised trial with single blinding, on 26 female athletes.

Both experimental groups will receive the same exercise protocol but in two different rooms in Miresmaili sport complex in Tehran city. One room in which feedback group will practice has full-mirrored walls. Exercise group will practice in another room without mirrored walls. Before each exercise, the examiner defines, and shows the correct alignment and ideal performance to the participants. In single blinding, assessor is not aware of subjects' information and their tests data are processed based on their given numbers, instead of their names.

Inclusion criteria: observing knee dynamic valgus by single-leg squat test and regular physical and sports activity between the last 3-5 years. Exclusion criteria: suffering from spine or lower extremity diseases, history of fracture, sprain, or strain in lower extremity, history of spine or lower extremity surgery, using any medicine or painkiller.

Exercise group: They practice 30 minutes of corrective exercises and jump-landing exercises without receiving feedback for 6 weeks (3sessions each week). Feedback group: They practice 30 minutes of corrective exercises and jump-landing exercises in front of a mirror to receive visual feedback for 6 weeks (3sessions each week). Control group: They do not receive any exercises and follow their daily sports routines.

Kinematics (angles) of hip, knee, and ankle joints, Kinetics (moments and reaction forces) of hip, knee, and ankle joints,Dynamic balance in anterior, posteromedial, and posterolateral directions.

After screening, by simple randomization participants will be divided into 3 groups of control (8 participants), exercise (8 participants), and feedback (10 participants). The randomization is going to be done by random numbers chart, by considering numbers between 0 to 8 for control group, 8 to 16 for exercise group, and 16 to 26 for feedback group. The researcher will choose one of the numbers and move through a previously determined direction and register the number and give it to the related group.

In this study, the assessor (who is the researcher) is blinded to the participants' information (single blinding), and the results of participants tests are analyzed based on participants' given number and without knowing their names. That information includes participants names, and weight, height, and age information.

After publication, the data which will be also presented in the article, will be given to the researchers in Excel format which includes the pre and post interventions' results of landing tests' biomechanical analysis and dynamic balance, for future studies like meta-analysis studies.

After publication

The published data of the current study will be accessible for the researchers in the academic institutes and universities, and also people who work in the industry.

After publishing the article, the data will be used in future researches, like meta-analysis or other types of researches.

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