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  1. No Access

    Article

    Application of empirical mode decomposition to heart rate variability analysis

    The analysis of heart rate variability, involving changes in the autonomic modulation conditions, demands specific capabilities not provided by either parametric or non-parametric spectral estimation methods. ...

    J. C. Echeverría, J. A. Crowe… in Medical and Biological Engineering and Com… (2001)

  2. No Access

    Article

    Applying fractal analysis to short sets of heart rate variability data

    The aim of this study was to explore the interchangeability of fractal scaling exponents derived from short- and long-term recordings of real and synthetic data. We compared the α1 exponents as obtained by detren...

    M. A. Peña, J. C. Echeverría, M. T. García… in Medical & Biological Engineering & Computi… (2009)

  3. No Access

    Article

    Effects of fetal respiratory movements on the short-term fractal properties of heart rate variability

    We evaluated the effect of fetal respiratory movements (RM) on the heart rate (HR) fractal dynamics.Abdominal ECG recordings were collected from low-middle-risk pregnant woman at rest. Mean gestational age was...

    M. R. Ortiz, J. C. Echeverría… in Medical & Biological Engineering & Computi… (2013)

  4. No Access

    Article

    Mid-Infrared Spectroscopy (MIR) for Simultaneous Determination of Fat and Protein Content in Meat of Several Animal Species

    The aim of this research was to study the application of MIR spectroscopy as an alternative to conventional methods to determine fat and protein content. Samples of the main species used to produce meat produc...

    M. Lozano, P. Rodríguez-Ulibarri, J. C. Echeverría, M. Beruete… in Food Analytical Methods (2017)

  5. No Access

    Article

    Kinetics of the acid-catalyzed hydrolysis of tetraethoxysilane (TEOS) by 29Si NMR spectroscopy and mathematical modeling

    Tetraethoxysilane (TEOS) is widely used to synthesize siliceous material by the sol–gel process. However, there is still some disagreement about the nature of the limiting step in the hydrolysis and condensati...

    J. C. Echeverría, P. Moriones, G. Arzamendi… in Journal of Sol-Gel Science and Technology (2018)