What role does ACTN3 play in menopause?

ACTN3 encodes alpha-actinin-3, a protein expressed in fast-twitch muscle fibers and linked to sprint/power performance. There is no established direct role for ACTN3 in menopause. Menopause is primarily driven by hormonal changes (declining estrogen), not by muscle-related genes. Some speculative sources suggest a connection to muscle loss during menopause, but this is not supported by clinical studies. The evidence is therefore 'unclear'. MyBody-X tests analyzing ACTN3 should not be used to assess menopause risk or progression. This genetic information is relevant for sports and fitness, not for reproductive endocrinology.