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image showing power lifters who were likely to have the ACTN3 functional polymorphism

ACTN3 Gene: Deficiency and Muscle Type

The ACTN3 gene codes for actinin alpha-3, a protein found in fast-twitch muscles. Some people don’t produce this protein, which changes the composition of their muscles. Elite athletes may be limited by this genetic change.

PPAR-Delta: Burning off the Fat

PPARδ is a key player in how and when your muscles burn fat for fuel. Genetic variants in the PPARD gene impact how well your muscles utilize fatty acids. These variants also impact how much of a fat-burning benefit you get from exercise.

Athletic Performance Genes

Genes control the formation, composition, and type of muscle fiber. Learn how to optimize your training when genetics comes into play, affecting muscle composition and endurance.