Glucose 6-phosphate dehydrogenase deficiency in an elite long-distance runner.

To the editor: Glucose 6-phosphate dehydrogenase (G6PD) deficiency is the world's most common enzymopathy[1][1] and caused by mutations in the X-chromosomal G6PD gene. The enzyme catalyzes the first reaction of the hexose monophosphate shunt, which results in 2 main products: pentose phosphate