Young Age Soccer Player's Lower Limb Muscle Imbalance and Functional Status

Study Overview
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Brief Summary
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A randomized controlled trial is designed to examine the effects of low-load and high-velocity eccentric exercises on lower limb muscular properties, imbalances and functional status of 13-15 years old female football players.

Detailed Description
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Twenty participants were included in the study. All participants were divided in two groups - control and experimental. In the experimental group (n=10) participants after team soccer training additional received 4 weeks eccentric exercises, in the control group (n=10) - did not perform additional exercises. The research group performed additional low-load and high-velocity - lying prone - eccentric hamstring exercise 3 times per week for 4 weeks. Pre- and post- training assessment included concentric/eccentric knee extension and flexion at 60°/s and 120°/s, changes in muscle contractile characteristics and dynamic balance.

Official Title
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The Effect of Eccentric Exercises on Lower Limb Muscle Imbalances and Functional Status of Young Female Football Players

Conditions
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Healthy

Intervention / Treatment
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* Behavioral: Low-load and high-velocity - lying prone - eccentric hamstring exercise


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Healthy players able to participate in training and competitions. Playing football for at least 2 years. Regularly participating in team training, 2-3 times a week. Exclusion Criteria: Female soccer players with a lower extremity injury (in a period of 6 months) Pain is less than 2 points on the Visual Analog Pain Scale. Irregular exercise The number of years of training attended is too low

Ages Eligible for Study
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Minimum Age: 13 Years
Maximum Age: 15 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| No Intervention: Control group<br>Control group will be asked to maintain their usual lifestyle. | |
| Experimental: Experimental group<br>The research group performed additional low-load and high-velocity - lying prone - eccentric hamstring exercise 3 times per week for 4 weeks. 12 sessions in total. | Behavioral: Low-load and high-velocity - lying prone - eccentric hamstring exercise<br>* Low-load and high-velocity - lying prone - eccentric hamstring exercise 3 times per week for 4 weeks.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Changes in isokinetic peak torque (with Biodex) | Knee extension/flexion isokinetic peak torque measurements will be done at 60°/s, 120°/s | Baseline and after 4 weeks | 
| Dynamic balance | Y-balance Test evaluates lower extremity strength, knee stability and dynamic balance in anterior, posteromedial and posterolateral direction. For each direction, three practice trials were allowed before three test trials were recorded. Mean reach distances (cm) was normalized to leg length, which was measured from the anterior superior iliac spine to the most distal portion of the medial malleolus. | Baseline and after 4 weeks | 
| Changes in muscle contractile characteristics (with tensiomyography (TMG)) | Muscle involuntary contractile characteristics of the lower-limb muscles-the rectus femoris (RF), vastus medialis (VM), vastus lateralis (VL), biceps femoris (BF), semitendinosus (ST), tibialis anterior (TA), gastrocnemius medialis (GM) and gastrocnemius lateralis (GL)-will be recorded by measuring the response of these muscles to an induced electric stimulus (provoked by two self-adhesive electrodes) using TMG equipment on both the left and right lower extremities. | Baseline and after 4 weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Young age soccer player, Eccentric hamstring exercise, Dynamic balance, Contractile muscle properties