- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00682123
Risk of Positive Doping Tests Following Ingestion of Supplements Contaminated With Trace Quantities of Nandrolone Metabolites
Supplement Contamination: Detection of Nandrolone Metabolites in Urine After Administration of Small Doses of a Nandrolone Precursor
There is compelling evidence that some dietary supplements consumed by the general population are manufactured and stored under conditions that lead to contamination of the end product with small amounts of extraneous materials. In most cases, this is harmless, but for athletes liable to drug testing as a consequence of their participation in sport, the potential consequences of even trivial amounts of a prohibited substance may be catastrophic. Quality control procedures for pharmaceutical products normally specify the absence of contaminants at a level of more than 0.1%, ie 1mg/g. However, in the case of an anabolic steroid such as nandrolone, the amount that will cause a positive test has been estimated to be about 1-3µg (Geyer et al, 2004). In the case of a supplement that is taken in high doses (20-30 g/d), such as for example creatine, this means that a contamination level of something closer to 0.00001% (ie 1µg/g) may cause a positive test. This work have been supported by recent findings from our laboratory (Judkins et al, 2006). These data demonstrate that as little as 10μg of 19-noradrostenedione (19-NorAD) added to a creatine supplement resulted in a positive doping test in all volunteers testing. This is one thousand times less that the purity level specified for pharmaceutical agents and at this level, these contaminants are without any pharmacological action.
Proposals are under development to regulate the sale of dietary supplements for use by athletes to avoid accidental doping positives as a result of ingestion of contaminated supplements. This requires a knowledge of the amounts of contaminant that is likely to cause problems. The aim of the present study was to examine the urinary excretion pattern of nandrolone metabolites following 1µg, 2.5µg and 5µg doses of 19-norandrostendione in both male and female subjects. The quantity of 19-norandrostenedione administered in this study is representative of the amount previously reported as an undeclared contaminant in some dietary supplements. Given the speculation surrounding positive doping cases being attributed to ingestion of sports supplements contaminated with pro-hormones, this presents an important consideration for both athletes and doping agencies, as well as supplement manufacturers.
Study Overview
Status
Conditions
Intervention / Treatment
Study Type
Enrollment (Actual)
Phase
- Phase 2
- Phase 1
Contacts and Locations
Study Locations
-
-
Leicestershire
-
Loughborough, Leicestershire, United Kingdom, LE11 3TU
- Loughborough University, School of Sport and Exercise Sciences
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Healthy male and female volunteers aged between 18 - 35 years of age
Exclusion Criteria:
- Any potential participant competing in sport at a level where there is even a remote possibility of being called for a drugs test was excluded
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Basic Science
- Allocation: Randomized
- Interventional Model: Crossover Assignment
- Masking: Single
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
Urinary 19-norandrosterone (19-NA) and 19-noretiocholanolone (19-NE) concentrations
Time Frame: All urine passed for 24h following supplement ingestion
|
All urine passed for 24h following supplement ingestion
|
Collaborators and Investigators
Sponsor
Collaborators
Investigators
- Principal Investigator: Ronald Maughan, PhD, Loughborough University
Publications and helpful links
General Publications
- Geyer H, Parr MK, Mareck U, Reinhart U, Schrader Y, Schanzer W. Analysis of non-hormonal nutritional supplements for anabolic-androgenic steroids - results of an international study. Int J Sports Med. 2004 Feb;25(2):124-9. doi: 10.1055/s-2004-819955.
- Maughan RJ. Contamination of dietary supplements and positive drug tests in sport. J Sports Sci. 2005 Sep;23(9):883-9. doi: 10.1080/02640410400023258.
- Judkins C, Watson P, Russell C. A crossover study of 19-nor-androstenedione contamination in sports supplements: preliminary findings. Proceedings of the 5th International congress on Medical Polymers. Cologne, Germany 2006.
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Other Study ID Numbers
- R05-P39
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
Clinical Trials on Positive Doping Tests in Sports
-
Parc de Salut MarWorld Anti-Doping AgencyCompletedHealthy Volunteers | Doping in SportsSpain
-
Central Hospital, Nancy, FranceRecruiting
-
McGill UniversityWorld Anti-Doping Agency; International Olympic Committee; Phantom Compass; Digitalmill...UnknownPerformance Enhancing Product Use | Doping in Sport
-
Hacettepe UniversityCompleted
-
Hacettepe UniversityCompletedSports Performance in ChildrenTurkey
-
University of Alabama at BirminghamCompleted
-
Central Hospital, Nancy, FranceRecruitingSports Injuries in ChildrenFrance
-
Sport Injury Prevention Research CentreAlberta Innovates Health Solutions; Calgary Board of Education; Calgary Catholic... and other collaboratorsUnknownImplementing a School Prevention Program to Reduce Injuries Through Neuromuscular Training (iSPRINT)Adolescent | Wounds and Injuries | Athletic Injuries | Sport Injury | Sports Injuries in Children
-
St. Petersburg Research Institute of Vaccines and...CompletedTolerability and Reactogenicity Trial of the Recombinant Tuberculosis Allergen in Healthy VolunteersTuberculosis | Skin TestsRussian Federation
-
Chang Gung Memorial HospitalMinistry of Science and Technology, TaiwanActive, not recruitingRelative Energy Deficiency in SportsTaiwan
Clinical Trials on 19-norandrostendione
-
AstraZenecaCompleted
-
Hasanuddin UniversityChulalongkorn UniversityCompleted
-
Raphael SerreauAssistance Publique - Hôpitaux de Paris; University Hospital, Paris; François...CompletedCoronavirus InfectionFrance
-
Melike CengizCompleted
-
AstraZenecaCompleted
-
University of PennsylvaniaPublic Health Management CorporationCompleted
-
University of Texas at AustinUnknownFood InsecurityUnited States
-
University of PennsylvaniaPublic Health Management CorporationCompleted
-
Medical College of WisconsinChildren's Hospital and Health System Foundation, WisconsinCompletedLymphoma, B-Cell | Lymphoma, Non-Hodgkin | Chronic Lymphocytic Leukemia | Small Lymphocytic LymphomaUnited States
-
Duke UniversityNorth Carolina Department of Health and Human ServicesCompleted