Does the AMPD1 C34T Polymorphism Influence Physical Performance in Elite Athletes?

Background/Objectives: Adenosine monophosphate deaminase deficiency has been implicated in impaired exercise capacity. We examined whether the AMPD1 C34T (rs17602729) genotype was associated with athlete status and performance in distance runners (DRs) and rugby union (RU) athletes. Methods: Participants included 621 elite male RU athletes, 666 elite/sub-elite male and female DRs, and 1029 male and female non-athletes (NA), all of European ancestry. Genotyping was performed using real-time PCR with TaqMan reagents. Genotype and allele frequencies were compared using χ2 tests, while performance data were analysed using Kruskal–Wallis H, Mann–Whitney U, one-way ANOVA, and t-tests, with Benjamini–Hochberg correction applied for multiple comparisons. Results: Genotype and allele frequencies did not differ between athletes and NA or between athlete groups. In all DRs, run times did not differ between genotypes, although participants with the CT genotype in the elite and elite male subgroups were up to 5% faster than CC and TT homozygotes. In RU, participants with the CC genotype played 13% longer per appearance than those with the CT genotype, while forwards and front five participants with the CC genotype played 13% and 26% longer per appearance than T-allele carriers, respectively. Front five T-allele carriers made 75% more clean breaks than the front five with the CC genotype despite playing for a shorter time, although this finding should be interpreted cautiously. Conclusions: In summary, while the AMPD1 C34T genotype was not associated with athlete status, the CC genotype was associated with greater RU playing time per appearance in forwards, and the CT genotype was associated with superior performance in elite DRs.