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Top: relationship between cardiac baroreflex sensitivity (BRS) and mean arterial pressure increase (MAPIncrease) following a spontaneous muscle sympathetic nerve activity (MSNA) burst. Bottom: the product of MAPIncrease and MNSA burst rate (MNSABR) also negatively correlated to cardiac BRS. ●, Smokers (n = 18); ○, nonsmokers (n = 42).
