A study on circadian rhythm utilizing the holter ECG recorder.
Tatsuhiro Kimura, Tomokazu Kawamura, Kiyoyuki YAMAZAKI, Katsuro OKAMOTO, Takashi Ito · Journal of Advanced Science · 1997
To investigate characteristics of circadian rhythm, all day holterrecording were analyzed. Power spectra were estimated from R-R interval series via FFT. High and low frequency components of R-R fluctuation were observed. We discussed the circadian profiles of R-R spectra and its sleep-related changes.