Autonomic characteristics of periodic limb movements: comparison of whole-night and stage N2 linear and non-linear heart rate variability.

Although the LF/HF ratio tended to be higher in the PLM group, this difference did not reach statistical significance (Fig. 2 ).

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During stage N2, SDNN, Poincaré long-axis standard deviation and detrended fluctuation analysis alpha-1 were elevated, approximate entropy was reduced, and very-low-frequency (VLF) power was increased; the low-frequency/high-frequency (LF/HF) ratio showed a trend toward elevation.

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