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. 2007 Aug 1;30(8):1019–1025. doi: 10.1093/sleep/30.8.1019

Figure 2.

Figure 2

Mean R-R interval, high-frequency components in normalized units (HFnu), low-frequency to high-frequency ratio (LF/HF) and respiration frequency changes during sleep in subjects with REM (rapid eye movement) sleep behavior disorder (RBD) and controls (2 × 2 analysis of variance). R-R interval decreased slightly in controls but did not change in subjects with RBD from non-rapid eye movement (NREM) sleep to REM sleep (Interaction: F = 4.1,P = 0.058). HFnu decreased significantly during REM sleep in controls only, whereas it remained unchanged in subjects with RBD (Interaction: F = 11.4, P < 0. 01). LF/HF ratio increased from NREM to REM sleep in controls only and did not change in subjects with RBD (Interaction: F = 15.9, P < 0. 001). Finally, respiration frequency increased from NREM to REM sleep in controls, but no change was seen between the 2 conditions in subjects with RBD (Interaction: F = 4.6, P < 0. 05).