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The circadian changes in 1-h integrated nerve activity (i-NA) of SGNA (A) and VNA (B) for an entire day at baseline and after MI. The circadian pattern of the SGNA was maintained after MI, but VNA did not exhibit a circadian pattern. (C) Significant circadian variation in heart rate. BPM = beats per min; other abbreviations as in Figures 1 and 2.
