MSTN and sarcopenia: Previous studies have associated polymorphisms with sarcopenia (ACTN3; MTHFR; NRF2) [59,60], muscle hypertrophy (TGFβ; Myostatin, GDF-8) [61,62] and response to ST (ACTN3, ACE, NOS3, PPARGC1A/B, VEGFA) [63,64,65,66,67,68,69].