|Impaired muscle performance. Likely endurance athlete.|
||Better performing muscles. Likely sprinter.
||Mix of muscle types. Likely sprinter.
||Impaired muscle performance. Likely endurance athlete.
Early reports such as [PMID 18043716] suggested this is under-represented in elite strength and sprint athletes, consistent with previous reports of impaired muscle performance. However this is more common in endurance athletes. This SNP makes fast-twitch muscle fibers completely unable to produce alpha-actinin-3. In 2016 a larger attempt at replication failed to find any signficant result