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. Author manuscript; available in PMC: 2010 Sep 24.
Published in final edited form as: Eur Respir J. 2009 Jul 2;35(1):124–131. doi: 10.1183/09031936.00178408

Figure 5.

Figure 5

Individual VE-PETCO2 (panel A) and P0.1-PETCO2 (panel C) slopes in 1999 and 2006, for each of the 14 subjects. These data demonstrate the variability between subjects with respect to the VE-PETCO2, and the P0.1-PETCO2 relation, and that on average there was no age-dependent change in either of these relationships. Panels B and D show the apnea points computed from VE-PETCO2 and P0.1-PETCO2, curves, respectively. The apnea point derived from the VE-PETCO2 curve was significantly lower in 2006 compared to 1999 (panel B), consistent with the left shift in the VE-PETCO2 calculated from the composite data (Fig. 3A). The apnea points derived from the P0.1-PETCO2 curve were the same in 1999 and 2006, consistent with the lack of change in central ventilatory drive, as shown for the composite data in Fig. 4. *, Different than 1999 at P<0.05.