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Effect of Elite Soccer Training on Routine Laboratory Parameters (SOCCERLAB)

This study has been completed.
Information provided by:
Saarland University Identifier:
First received: July 24, 2009
Last updated: NA
Last verified: July 2009
History: No changes posted
Repeated blood sampling within a regular soccer season of German first league clubs shall serve to define soccer-specific reference values for routine parameters determined from venous blood. It was hypothesized that only for a minor number of parameters common reference values will have to be adapted for soccer players during their competitive season.


Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Prospective
Official Title: Laboratory Values in Elite Soccer Players

Further study details as provided by Saarland University:

Primary Outcome Measures:
  • complete blood count [ Time Frame: August 2008 until May 2009 ]

Secondary Outcome Measures:
  • numerous serum parameters from venous blood [ Time Frame: August 2008 until May 2009 ]

Biospecimen Retention:   Samples Without DNA
iced serum samples

Enrollment: 467
Study Start Date: August 2008
Study Completion Date: July 2009
Primary Completion Date: May 2009 (Final data collection date for primary outcome measure)
soccer players
players of the first two German soccer leagues

Detailed Description:
It is often difficult to discern exercise-induced changes in laboratory parameters from pathological changes in elite athletes during the regular training process. This is particularly true in soccer players who compete more often than many other athletes. Therefore, soccer players of the first two German soccer leagues (all professional athletes) are recruited for repeated blood sampling during the season (4 sampling times, one of them immediately before training commences in the summer, the other ones in October/November, February/March, and April/May). Among other standardizing requirements, it is mandatory that precisely one training session (not zero, not two, no competition) takes place the day before sampling. Several confounders for the interpretation of laboratory results are verified by means of a questionnaire. Phases of high competitive stress are compared with those of low stress. The course of the parameters as well as confidence intervals for given times during the season are of main interest.

Ages Eligible for Study:   18 Years to 40 Years   (Adult)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
soccer players of the first two German professional soccer leagues

Inclusion Criteria:

  • being employed as player by a club of the first two German soccer leagues
  • healthy

Exclusion Criteria:

  • chronic disease interfering with one or more of the determined parameters
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Please refer to this study by its identifier: NCT00946855

Institute of Sports and Preventive Medicine, University of Saarland, Campus, Bldg. B 8-2,
Saarbrücken, Saarland, Germany, 66123
Sponsors and Collaborators
Saarland University
Principal Investigator: Tim Meyer, MD, PhD Institute of Sports and Preventive Medicine, University of Saarland, Campus, Bldg. B 8-2, 66123 Saarbrücken, Germany
  More Information

Additional Information:
Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Prof. Dr. med. Tim Meyer, Institute of Sports and Preventive Medicine, University of Saarland, Campus Bldg. B 8-2, 66123 Saarbrücken, Germany Identifier: NCT00946855     History of Changes
Other Study ID Numbers: Soccer laboratory values
Study First Received: July 24, 2009
Last Updated: July 24, 2009

Keywords provided by Saarland University:
elite athletes
Define reference blood parameters in elite athletes processed this record on May 25, 2017