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Representative recordings of the integrated muscle sympathetic nerve activity (MSNA) neurogram and detected action potentials (APs) (and associated chemoreflex stimuli) from one individual during the functional residual capacity (FRC) apnea and rebreathing (RBR) protocols. Po2, partial pressure of oxygen; Pco2, partial pressure of carbon dioxide; HbSat, hemoglobin saturation. Highlighted (i.e., boxed) areas represent portions of the maneuver used for analysis.
