The article cites a study that investigates whether glucose-6-phosphate dehydrogenase (G6PD)-deficient individuals can exercise without greater perturbations in their redox status compared with non-G6PD-deficient individuals. Nine males with established G6PD-deficiency and nine males with normal G6PD performed two exhaustive treadmill exercise protocols of different duration, in which hematological parameter, reduced glutathione, oxidized glutathione, thiobarbituric acid reactive substances, protein carbonyls, catalase and total antioxidant capacity were measured in the blood before and after each exercise. Result shows that G6PD-deficient individuals are able to exercise until exhaustion without higher oxidative stress compared with non-G6PD-deficient individuals.