We would like to thank the members of the DeBiasi Lab at Baylor College of Medicine for the data and motivation they provided and Rich Baraniuk at Rice University for the direction and resources he provided.

Sources:

• Matlab Software at http://crttsn.univ-nantes.fr/~auger/tftb.html
• Matlab Software at http://www.ens-lyon.fr/~flandrin/emd.html
• Echeverria J C, Crowe J A, Woolfson M S, Hayes-Gill B R. "Application of empirical mode decomposition to heart rate variability analysis." Med. Biol. Eng. Comput., 2001, 39, 471-9
• Berger R D, Akselrod S, Gordon D, Cohen R J. "An Efficient Algorithm for Spectral Analysis of Heart Rate Variability." IEEE Transactions Biomed. Eng., Sep. 1986, BME-33, No. 9