Although linear detrended heart rate power spectral analysis and the MPF-var technique yielded substantially similar results, the MPF-var technique resulted in signal amplification at specific frequencies.
The MPF-var technique for heart rate variability analysis may cause signal amplification at specific frequencies compared to linear spectral techniques, depending on signal and polynomial parameters.
The purpose of this paper is to analytically evaluate and compare two of the most common methods for measuring respiration-related heart rate fluctuations: linear detrended heart rate power spectral analysis and the Porges technique of filtered variance. Low-frequency power was removed from instantaneous 4-Hz R-R interval signals using either a first-order linear (linear/spectral technique) or a third-order polynomial (MPF-var technique). The signals were band-pass filtered and analyzed in both the time and frequency domains. Although in most cases the two techniques yielded substantially similar results, the MPF-var technique resulted in signal amplification at a few specific frequencies. The frequency range and effect to amplification of the MPF-var technique were dependent upon the polynomial size, sampling frequency, and frequency content of the signal.
Litvack et al. (Fri,) conducted a other in Heart rate variability. Linear detrended heart rate power spectral analysis vs. Porges technique of filtered variance (MPF-var technique) was evaluated on Respiration-related heart rate fluctuations. Although linear detrended heart rate power spectral analysis and the MPF-var technique yielded substantially similar results, the MPF-var technique resulted in signal amplification at specific frequencies.
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