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Effects of different hypoxic and hypercapnic degrees on sighs. A: representative recordings of sighs induced by 3 different hypoxic (1.5 min) and hypercapnic (4 min) exposures. To emphasize the sigh responses, the moving average of the tidal volume (Vt) is presented and the spikes reflect sighs. B and C: grouped responses of sigh number (left) and amplitude (right) to hypoxia (B) or hypercapnia (C). Data are presented as means ± SE; n = 6.
