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Original records from an average-fit (A) and high-fit (B) subject illustrating muscle sympathetic nerve activity (MSNA) and respiratory tracings at baseline and 120 min following consumption of the mixed meal. In response to the mixed meal, MSNA burst incidence increased 11 and 23 bursts/100 heart beats in the average-fit and high-fit subject, respectively. V, volts; AU, arbitrary units.
