Effect of Whey Protein on Soccer Performance

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

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.

Study Overview

• Status: Unknown
• Conditions: Muscle Damage
• Intervention / Treatment: Dietary supplement: Whey protein

• Study Type: Interventional
• Enrollment (Anticipated): 50
• Phase: Not Applicable

Contacts and Locations

• Study Contact: Name: Ingeborg A Brouwer, PhD; Phone Number: +31-20-5987702; Email: ingeborg.brouwer@falw.vu.nl

Study Locations

• Netherlands
  • Amsterdam, Netherlands
    • Recruiting
    • Ajax
    • Contact: Niels Wijne, MD; Email: .n.wijne@ajax.nl
    • Principal Investigator: Niels Wijne, MD

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 15 years to 19 years (Child, Adult)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: Male

Description

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

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Prevention
• Allocation: Randomized
• Interventional Model: Crossover Assignment
• Masking: Double

What is the study measuring?

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

Collaborators and Investigators

• Sponsor: VU University of Amsterdam
• Investigators: Principal Investigator: Ingeborg A Brouwer, PhD, VU University of Amsterdam

Study record dates

Study Major Dates

• Study Start: March 1, 2010
• Primary Completion (Anticipated): June 1, 2010
• Study Completion (Anticipated): July 1, 2010

Study Registration Dates

• First Submitted: April 22, 2010
• First Submitted That Met QC Criteria: April 22, 2010
• First Posted (Estimate): April 26, 2010

Study Record Updates

• Last Update Posted (Estimate): April 26, 2010
• Last Update Submitted That Met QC Criteria: April 22, 2010
• Last Verified: March 1, 2010

More Information

Terms related to this study

• Keywords: Soccer; Whey protein; Muscle recovery; Intermittent exercise
• Other Study ID Numbers: AJA-PROT-IAB-001