Daqrouq  , N. M. Abu-Shikhah  , 
    Heart Rate Variability Analysis Using Wavelet Transform,
    Asian Journal of Information Technology,
    Volume 4,Issue 4,
    2005,
    Pages 356-359,
    ISSN 1682-3915,
    ajit.2005.356.359,
    (https://makhillpublications.co/view-article.php?doi=ajit.2005.356.359)
    Abstract: Heart Rate Variability (HRV) is a very important measure that helps in understanding how the nervous system controls blood circulation (symptho-vagal balance at the sinus node). HRV is currently estimated using frequency domain based methods such as Fast Fourier Transform (FFT). In this paper we propose a novel method based on the Wavelet Transform (WT). This proposed method is applied to the detection of the Tachycardia, Bradycardia and the irregularity of R-R interval.
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