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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 6. Change in the strength of CRPS, RSA and breathing frequency (Bfreq) across sleep stages.

Figure 6

Group average values for each sleep stage are normalized with respect to REM sleep. Notably, the sensitivity of CRPS to sleep-stage transitions is by a factor of 10 higher than RSA, indicating that sleep regulation and related changes in breathing frequency across sleep stages affect these two forms of cardio-respiratory coupling very differently.