Estimating respiratory frequency from autoregressive spectral analysis of heart period. Thayer, J., Sollers, J., I., Ruiz-Padial, E., & Vila, J. IEEE Engineering in Medicine and Biology Magazine, 21(4):41-45, 2002.
Estimating respiratory frequency from autoregressive spectral analysis of heart period [pdf]Paper  abstract   bibtex   
In this article we report the results of a pilot study and a larger investigation that examined the relationship between respiration frequency assessed using the traditional mercury strain gauge and using the central frequency of the HF component derived from autoregressive spectral analysis.

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