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. Author manuscript; available in PMC: 2014 Jun 11.
Published in final edited form as: Prog Brain Res. 2014;209:191–205. doi: 10.1016/B978-0-444-63274-6.00010-2

FIGURE 4.

FIGURE 4

Poincaré plots. The duration of expiration (TE) of the next cycle is plotted against the TE of the current cycle to display cycle-to-cycle variability. In four chronic intermittent hypoxic-conditioned rats, the variability of TE is small and forms a tight cluster points. Compare this to four chronic-sustained hypoxic-conditioned rats in which the points are distributed widely. However, the distribution forms a tight cluster after both the aortic depressor and carotid sinus nerve are transected.