IEEE Transactions on Biomedical Engineering · 1982 · 693 citations · 7 references
EngineeringPhysiologyNeurophysiologyBiological OscillationsFluctuation AnalysisFourier AnalysisFrequency ResponseHeart Rate VariabilityTime-frequency AnalysisFrequency Fluctuation AnalysisPower Spectral DensityPower Spectral Density AnalysisPower Spectral Density EstimationSpectral Density FunctionsSpectral Fluctuation AnalysisTime Series Fluctuation Analysis
It is found that a heartbeat period fluctuation usually has a power spectral density which is inversely proportional to frequency, to which a spike is added at a breathing frequency.
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Experimental studies on 1/f noise
F.N. Hooge, T.G.M. Kleinpenning, L.K.J. Vandamme · Reports on Progress in Physics · 1981 · 1.1K citations
The Schottky Effect in Low Frequency Circuits
J. B. Johnson · Physical Review · 1925 · 432 citations