Skeletal muscle growth in response to training is determined by genetics, and a rare version of the MSTN gene.


Global population distribution:

Source: 1000 Genome Project. Global averages for both sexes

MSTN: KK

87%

MSTN: KR

11%

MSTN: RR

2%

More about MSTN

The MSTN gene codes for a protein called myostatin. Myostatin helps to regulate and limit muscle growth. A lack of myostatin is associated with much greater muscle mass and strength.

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