Effects of Hamstrings Strengthening in Proffesional Athlets

Study Overview
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Brief Summary
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Athelts that meet the inclusion criteria will be randomized into two groups. The experimental group will receive an 8-week (3 days per week) specificl protocol based on hamstring strengthening (isometric, concentric and excentric exercises), and the control group will not receive any additional exercise. The aim of the study is to investigate the changes in hip and knee muscle strength, in the extensibility of cuadriceps, hamstrings and hip abductors, in the physical functions and in the final marks.

Official Title
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Effects of Hamstrings Strengthening in Proffesional Athlets

Conditions
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Exercise, Hamstring Injury

Intervention / Treatment
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* Other: hamstring strengthening


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Professional Athlet 3 or more trainign days Previous hamstring injury but without symptoms for 3 months or >30% difference between cuadriceps and hamstrings strength (considered as a risk for hamstring injury) Exclusion Criteria: Sistemic pathologies Any other type of musculoskeletal injuries in lower limb or lumbar spine To have a previous specific protocol To skip more than 3 training days General contraindications for physical activity

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 25 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

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


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: hamstring strengthening<br>8-week protocol (3 days per week) based on isometric, concentric and excentric exercisesof hamstrings | Other: hamstring strengthening<br>* A progressive and individualized hamstring strengthening protocol<br>|
| No Intervention: Control<br>No intervention added to regular training. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| muscle strength | the examiners assess the muscle strength using a hand-held dynamometer (model 01165) for hip and knee muscles | Baseline | 
| muscle strength | the examiners assess the muscle strength using a hand-held dynamometer (model 01165) for hip and knee muscles | up to 8 weeks | 
| muscle extensibility | the examiners assess the extensibility of the hip flexors, abductors and extensor muscles | Baseline | 
| muscle extensibility | the examiners assess the extensibility of the hip flexors, abductors and extensor muscles | up to 8 weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Physical function | the examiners assess the physical function using vertical jump test | Baseline | 
| Physical function | the examiners assess the physical function using vertical jump test | up to 8 weeks | 
| Mark | the examiners assess the marks in competition | Baseline | 
| Mark | the examiners assess the marks in competition | up to 8 weeks | 
| Number of hamstring injuries | the examiners assess the number of hamstring injuries | Baseline | 
| Number of hamstring injuries | the examiners assess the number of hamstring injuries | up to 8 weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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exercise, therapeutics, prevention