Is the HRV subject to daily fluctuations?
Yes. A difference between day and night rhythms is especially apparent, with the influence of the sympathetic nervous system dominating during the day and that of the parasympathetic nervous system during the night. The HRV also fluctuates according to the stage of sleep, which has motivated some sleep researcher to classify sleep stages according to the HRV. Hormones also appear to be able to trigger fluctuations in the HRV over the course of a day.
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