POWERS, S.K., and R.A. SHANELY. Exercise-induced changes in diaphragmatic bioenergetic and antioxidant capacity. Exerc. Sport Sci. Rev., Vol. 30, No. 2, pp. 69–74, 2002. The primary inspiratory muscle in mammals is the diaphragm. Endurance exercise elevates both the oxidative and antioxidant capacity of the costal and crural diaphragm. These exercise-induced changes in oxidative and antioxidant capacity occur rapidly after the onset of training and are associated with reduced oxidative injury and improved diaphragmatic endurance.