Key result
ACTN3 R577X polymorphism favors muscle force while its absence may improve endurance via oxidative metabolism.
Why the study?
The relationship between the R577X polymorphism of the ACTN3 gene and sports performance requires further clarification, especially regarding its metabolic role in humans.
The ACTN3 R577X polymorphism may influence sports performance, with the functional protein favoring force generation and its absence potentially favoring endurance.
ACTN3 R577X may influence muscle force; leaves open its value for performance prediction or athlete selection pending prospective validation.
The aim of the present study was to review the evidence on the relationship between the R577X polymorphism of the ACTN3 gene and sports performance. The Pubmed database was searched using ACTN3 gene AND sports performance as keywords. The ACTN3 gene encodes a muscle-specific protein, called α-actinin-3, which is only present in type II fibers. Most studies have demonstrated a relationship between the presence of α-actinin-3 and the ability of muscle to generate force. However, recent studies suggest that the absence of the functional form of this protein may regulate substrate utilization during exercise, giving priority to oxidative metabolism, sparing muscle glycogen, and improving performance in long-duration events. Nevertheless, further studies involving humans are needed to better understand the metabolic role of this protein.
No takes yet. Share an insight, caveat, or question.
Pasqua et al. (2011) conducted a review in Sports performance. R577X polymorphism of the ACTN3 gene was evaluated on Sports performance. The R577X polymorphism of the ACTN3 gene is associated with muscle force generation, while its absence may improve performance in long-duration events by prioritizing oxidative metabolism.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: