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. Author manuscript; available in PMC: 2012 Oct 11.
Published in final edited form as: Hypertension. 2011 Feb 28;57(4):723–730. doi: 10.1161/HYPERTENSIONAHA.110.163147

Figure 2.

Figure 2

Changes in HRV during wakefulness (Figure 2A), during REM sleep (Figure 2B) and during NREM sleep (Figure 2C). Data are presented as mean±SEM. HF, high frequency, LF, low frequency, nu, normalized units.