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Changes in the HRV-related variables in transition from periods without PLMS to those with PLMS. (A) VLF, very low frequency; (B) LF, low frequency; (C) HF, high frequency; (D) FHFB, fluctuation of a HF band; PLMS, periodic leg movements during sleep. Data are expressed as means ± standard errors. Note: “0” on the time axis signifies the beginning of the period with PLMS.
