Effect of different dose of hydrogen saline administered intraperitoneally on myeloperoxidase activity in supernatants of homogenates from carrageenan-treated paws. Paw myeloperoxidase activities were measured at 4 h after carrageenan treatment. Each bar represents the mean of 7 animals and vertical lines show the S.E.M. *P < 0.05, **P < 0.01. CA = carrageenan treatment. CA + saline = carrageenan and saline treatment. HS = carrageenan and hydrogen saline treatment.