Effect of Whey Protein on Soccer Performance

Study Overview
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Brief Summary
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Rationale: During exercise protein breakdown in muscles is larger than protein synthesis. This negative muscle protein balance leads to increased muscle damage and thereby to a reduced muscle tissue recovery. To achieve a positive muscle protein balance and reduce muscle damage, many athletes use proteins. In professional soccer players, considerable stress is placed on the musculoskeletal system. Recovery time is often too short for these players to restore homeostasis, which results in catabolic processes. This increases playing errors and will lead to lapses in concentration. Therefore, it is of great importance for a professional soccer team to be in optimal condition and a fast recovery after exercise is desirable to accomplish maximum performance. Supplementation with whey proteins is thought to support this. Objective: To assess whether post-exercise supplementation with whey protein will lead to a better muscle recovery than supplementation with carbohydrates in Dutch soccer players between the age of 15 and 18 years old. Study design: A double blind randomised controlled cross-over trial. Study population: Healthy soccer players of the A and B selection of AJAX between the age of 15 and 18 years old. Intervention: Supplement, containing either whey proteins or an isocaloric carbohydrate placebo. Each supplement will be administered for 2 weeks separated by a 7 day washout period. Treatment order will be randomly assigned. Main study parameters: The main study parameter will be the Yo-Yo intermittent recovery test level 2 score and the vertical jump test. The scores will evaluate the soccer players' ability to repeatedly perform intense exercise and his potential to recover from this exercise.

Official Title
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The Effect of Post-exercise Supplementation With Whey Protein Versus Carbohydrate on Soccer Performance.

Conditions
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Muscle Damage

Intervention / Treatment
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* Dietary Supplement: Whey protein


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: performing soccer >1 year part of A & B selection of AJAX Exclusion Criteria: presence of lactose intolerance presence of illness presence of injury

Ages Eligible for Study
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Minimum Age: 15 Years
Maximum Age: 19 Years

Sexes Eligible for Study
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Male

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: Crossover Assignment
Masking: Double


Arms and Interventions

| Intervention/Treatment |
| --- |
|Dietary Supplement: Whey protein|20g, oral, dissolved in yoghurt-drink, after every training and match for 2 weeks|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Muscle recovery | Recovery will be measured with the test scores on the Yo-Yo Intermittent Recovery Test level 2 and the Countermovement Jumping Test. | 2 weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Muscle recovery, Intermittent exercise, Whey protein, Soccer