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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 alternating functional residual capacity (FRC) apnea and rebreathe (RBR) protocol (FRC-RBRALT). Po2, partial pressure of oxygen; Pco2, partial pressure of carbon dioxide; HbSat, hemoglobin saturation. Boxed area represents the portion of the maneuver used for analysis (see insets).
