American Society of Anesthesiologists

Fig. 2. The mean ventilatory (left ) and heart rate (right ) responses to the sustained hypoxic test expressed as change in V̇ior heart rate per percent in arterial hemoglobin–oxygen saturation (SpO2). For periods N, H1, H2, and H3see legend of figure 1. The data points between periods H1and H2are 1-min averages of minutes 6 (i.e. , H1+ 3 min), 9, and 12 of hypoxia. Values are mean ± SD.

Fig. 2. The mean ventilatory (left ) and heart rate (right ) responses to the sustained hypoxic test expressed as change in V̇ⁱor heart rate per percent in arterial hemoglobin–oxygen saturation (Sp^O²). For periods N, H¹, H², and H³see legend of figure 1. The data points between periods H¹and H²are 1-min averages of minutes 6 (i.e. , H¹+ 3 min), 9, and 12 of hypoxia. Values are mean ± SD.

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