Changes in fractal structure of heart rate variability during a nap in one case.
The objective of the present study was to analyze fractal structures of adult heart rate (HR) variability during a nap. Fractal analysis was carried out in one case over consecutive 10-min time series of HR, which were simultaneously recorded with electroencephalogram. Scaling relationships showed cross-over patterns characterized by alphas and alphal (i.e. slopes above and below a cross-over point). The alphas and alphal were black and white noise at Stage 4 of NREM sleep, and black and 1/f noise in REM sleep. Cross-over points changed from the first to second sleep cycle. We demonstrate the multifractal structures of HR variability during a nap in the present case.
Shono
H
H
Medical Information & Intelligence Center, Saga Medical School Hospital, Saga, Japan. shonoh@post.saga-med.ac.jp
Shono
M
M
Takasaki
M
M
Iwasaka
T
T
Sugimori
H
H
D000328:Adult; D004569:Electroencephalography; D017709:Fractals; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D012895:Sleep, REM / Q000502:physiology*