ACTN3 and sarcopenia: Binary logistic regression analyses (unadjusted model) showed that sarcopenia was associated with MTHFR (AC + CC; OR = 2.428, 95% CI = 1.179–4.999, p = 0.016), with ACTN3 (RX + XX; OR = 2.753, 95% CI = 1.145–6.618, p = 0.024) and with NRF2 (AC + CC; OR = 3.261, 95% CI = 1.091–9.748, p = 0.034) under a dominant model, and with MTHFR (CC; OR = 11.043, 95% CI = 4.502–27.085, p < 0.001), with ACTN3 (XX; OR = 2.305, 95% CI = 1.104–4.816, p = 0.026), and with NRF2 (CC; OR = 2.429, 95% CI = 1.174–5.025, p = 0.017) under a recessive model, respectively (Table 1).