Previous studies have shown an increase in GLUT4 expression after 3–10 weeks of endurance exercise training in both healthy young men, with and without overweight (Biensø et al., 2015; Dela et al., 1993; Frøsig et al., 2007; Nordby et al., 2012) and in middle‐aged men with insulin resistance or type 2 diabetes (Christ‐Roberts et al., 2004) supporting our findings at 3 months. This evidence concerns the gene SLC2A4 and type 2 diabetes mellitus.