## Signal Processing Methods for Heart Rate Variability (1998)

Citations: | 3 - 2 self |

### BibTeX

@TECHREPORT{College98signalprocessing,

author = {St. Cross College and Supervised Prof and L. Tarassenko and Gari D. Clifford and Gari D. Clifford},

title = {Signal Processing Methods for Heart Rate Variability},

institution = {},

year = {1998}

}

### OpenURL

### Abstract

and except where otherwise stated, describes my own research.

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Citation Context ...ve baseline shifts, but usually a scale must be chosen over which the detrending is performed and the HRV is over-estimated at this scale. Recently, scale-invariant techniques have also been proposed =-=[15, 16, 17, 29, 268]-=- to allow a measure of the fractal behaviour of the RR tachogram. These methods include: ¯ The Fano Factor [268]: the variance of the number of events in a specified counting time Ì divided by the mea... |

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Citation Context ...al-to-Normal (N-N), intervals should be rejected from a study. However, he also acknowledges that this is an arbitrary threshold. Many different exclusion criteria have been proposed by other authors =-=[138, 147, 172, 181, 184]-=-, often with little justification. In many cases, where trials have been carried out to analyse the performance of algorithms using different RR interval exclusion criteria, the types of noise and art... |

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Citation Context ...r spectral components that can be distinguished more easily, and if the model order is chosen correctly can allow an accurate estimation of the PSD over very short windows. In 1989 Albrecht and Cohen =-=[10]-=- carried out experiments to compare the Fast Fourier Transforms (FFT) of linearly re-sampled RR tachograms with an autocorrelation method for constructing the PSD from only the original data points. T... |

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Citation Context ... depressed LVEF and increased ventricular ectopic activity) [184, 282]. ¯ Prediction of mortality - For prediction of all-cause mortality, HRV is similar to that of left ventricular ejection fraction =-=[184, 208]-=-. ¯ Prediction of arrhythmic events - HRV is superior to left ventricular ejection fraction in predicting arrhythmic events such as sudden cardiac death or ventricular tachycardia [184, 208] 22 partic... |

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Citation Context ...ve baseline shifts, but usually a scale must be chosen over which the detrending is performed and the HRV is over-estimated at this scale. Recently, scale-invariant techniques have also been proposed =-=[15, 16, 17, 29, 268]-=- to allow a measure of the fractal behaviour of the RR tachogram. These methods include: ¯ The Fano Factor [268]: the variance of the number of events in a specified counting time Ì divided by the mea... |

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Citation Context ... where the activation function is linear (�� � ) for the input and hidden layers; � � Æ� Ô� Â� �� �� �� � Ô � Û��sØ Ô � 7 Sections 3.3.5 to 3.3.11 have been previously published by Clifford et al. in =-=[54]-=- and [265] 93 (3.21)swhere Â is the number of hidden units. If this expression is differentiated with respect to Û�� and the derivative is set to zero the usual equations for least-squares optimisatio... |

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Citation Context ...the mean Ä� -ratios for each of these sleep states is calculated for each À� spectral estimation method using the F-test, the Kolmogorov-Smirnov (K-S) test, and Student’s t-test for unequal variances =-=[229, 71]-=-. The F-test evaluates the probability that the variances in each distribution are significantly different (and hence one variance is significantly less than another). The K-S statistic is used for ca... |