Sport Integrity Australia acknowledges that Wheelchair Rugby Australia has imposed a two-year period of Ineligibility on athlete Jacob Cremen-Darkin for the Presence and Use of a Prohibited Substance/s.
Mr Cremen-Darkin returned an Adverse Analytical Finding from an In-Competition doping control test on 4 May 2024.
Mr Cremen-Darkin’s sample was analysed at the Sports Medicine Research Testing Laboratory in South Jordan, Utah, USA, and the presence of 4-methylhexan-2-amine (methylhexaneamine) and 5-methylhexan-2-amine (1,4-dimethylpentylamine) were detected.
It has been determined that on 4 May 2024, the Prohibited Substances 4-methylhexan-2-amine (methylhexaneamine) and 5-methylhexan-2-amine (1,4-dimethylpentylamine) were present in Mr Cremen-Darkin’s sample (Presence).
Further, it was determined that on and/or before 4 May 2024 (in-compeititon), Mr Cremen-Darkin used or attempted to use the Prohibited Substances 4-methylhexan-2-amine (methylhexaneamine) and 5-methylhexan-2-amine (1,4-dimethylpentylamine) (Use).
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These substances are listed under Class S6 (Stimulants) of the World Anti-Doping Code – International Standard – Prohibited List 2024 (2024 Prohibited List). 4-methylhexan-2-amine (methylhexaneamine) and 5-methylhexan-2-amine (1,4-dimethylpentylamine) are prohibited In-Competition and are classed as Specified Substances.
Under Article 10.2.1.2 of the Australian National Anti-Doping Policy 2021 (ANADP), for ADRVs of Presence and Use of a Specified Substance the sanction is four (4) years if Sport Integrity Australia can establish that the ADRVs were intentional. If Sport Integrity Australia cannot establish that the ADRVs were intentional the period of Ineligibility is two (2) years pursuant to Article 10.2.2 of the ANADP.
Wheelchair Rugby Australia has imposed a two-year period of Ineligibility (backdated by a period of nine months in accordance with Article 10.13.1 of the ANADP for delays not attributable to the Athlete) commencing on 1 July 2025.
As such, Mr Cremen-Darkin is ineligible to participate in any sports that have adopted a World Anti-Doping Code compliant anti-doping policy between 1 July 2025 and 11:59pm on 30 September 2026.
He is also not permitted to compete in a non-signatory professional league, or event organised by a non-signatory International or National level event organisation.
Additional information on the Prohibited Substance
4-methylhexan-2-amine (methylhexaneamine, DMAA) and 5-methylhexan-2-amine (1,4-dimethylpentylamine) are categorised as Stimulants and are listed by the World Anti-Doping Agency (WADA) as Prohibited In-Competition under the ‘S6 Stimulant’ substance class.
4-methylhexan-2-amine (methylhexaneamine, DMAA) and 5-methylhexan-2-amine (1,4-dimethylpentylamine) are sympathomimetic, meaning they mimic the effects of adrenaline, constricting blood vessels and increasing heart rate.
These substances are associated with high-risk side effects including but not limited to; hypertension (increased or high blood pressure), heart attack, stroke and nervous and psychiatric disorders.
4-methylhexan-2-amine (methylhexaneamine, DMAA) is listed in Schedule 10 of the Therapeutic Goods (Poisons Standard) and is therefore prohibited for supply in Australia.
5-methylhexan-2-amine (1,4-dimethylpentylamine) has known to be falsely listed and marketed as “natural” within some supplement products.
All prohibited substances are added to the Prohibited List because they meet at least two of the three following criteria:
- The substance has the potential to enhance or enhances performance;
- The substance represents an actual or potential health risk to the Athlete; and
- The substance violates the spirit of sport.
Sport Integrity Australia recommends athletes check substances and medications before taking them and to follow our advice on any sport supplements.
The Sport Integrity app provides a useful resource for athletes and support staff to check substances and medications.
Download the free Sport Integrity App from the:
- App Store or;
- Google Play