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Heart rate (HR) of sham and fluid percussion injured (FPI) rats changed across experimental days during the dark (A) and light (B) periods. An increase in HR was evident at 14:00 h. These increases were more pronounced in FPI animals during the first week of exercise (C). Increases in HR were more pronounced in animals exposed to the vRW at 14:00 h during postinjury day 35 (D). Each value represents the mean HR (beats per min)±standard error of the mean. *p<0.05.
