Data from Japan [42] suggest that the AT is lower in patients with iron deficiency anaemia than in non-athletic controls (AT 15.9 ± 3.3 versus 21.3 ± 1.3 mL · kg−1 · min−1, p < 0.01) and responds to increases in [Hb] following iron supplementation ([Hb] 9.0 ± 1.8 to 12.1 ± 0.8 g · dL−1), AT (20.9 ± 6.3 to 25.0 ± 8.0 mL · kg−1 · min−1, p < 0.001). The gene discussed is GSTM1; the disease is Iron deficiency anemia.