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Box plots illustrating the changes in HR (A), MABP (B), and PP (C) of rats either diving or swimming. Hemodynamic parameters taken just before the exercise are in hatched boxes, while those taken during the exercise are in open boxes. Note that the hemodynamic parameters were significantly different between rats voluntarily diving underwater and those swimming on the water's surface. *P < 0.05, ***P < 0.001.
