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. Author manuscript; available in PMC: 2015 Feb 6.
Published in final edited form as: Comput Cardiol (2010). 2014 Sep;41:781–784.

Figure 8. Coexisting forms of cardio-respiratory coupling, CRPS and TDS, function at different time scales.

Figure 8

Probability distributions of the length of CRPS epochs (red) and of TDS epochs (light-blue) indicate significant difference in the average epoch length. Thus, different forms of coupling acting on very different time scales are captured by these two measures. Both measures, CRPS and TDS, reveal a transient nature of the cardio-respiratory coupling, with “on” and “off” periods even within a single sleep stage. Results are obtained from all healthy subjects during the entire sleep period.