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J Appl Physiol 86: 1081-1091, 1999;
8750-7587/99 $5.00
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Vol. 86, Issue 3, 1081-1091, March 1999

SPECIAL COMMUNICATION
Wavelet transform to quantify heart rate variability and to assess its instantaneous changes

Vincent Pichot1, Jean-Michel Gaspoz2, Serge Molliex3, Anestis Antoniadis4, Thierry Busso1, Frédéric Roche1, Frédéric Costes1, Luc Quintin5, Jean-René Lacour6, and Jean-Claude Barthélémy1

1 Laboratoire de Physiologie-Groupement d'Intérêt Public Exercice, Université de Saint-Etienne, Saint-Etienne 42055; 3 Département d'Anesthésie et Réanimation, Hôpital Universitaire, Saint-Etienne 42055; 4 Département de Statistiques, Université Joseph Fourier, Grenoble 38041; 5 Laboratoire de Physiologie de l'Environnement, Unité de Recherche Associée, Centre National de la Recherche Scientifique, 1341, Hôpital Universitaire Rockefeller, Lyon 69373; and 6 Laboratoire de Physiologie-GIP Exercice, Université Lyon I, Lyon, France 69921; and 2 Département de Médecine Interne, Hopitaux Universitaires de Genève, Geneva, Switzerland 1211

Heart rate variability is a recognized parameter for assessing autonomous nervous system activity. Fourier transform, the most commonly used method to analyze variability, does not offer an easy assessment of its dynamics because of limitations inherent in its stationary hypothesis. Conversely, wavelet transform allows analysis of nonstationary signals. We compared the respective yields of Fourier and wavelet transforms in analyzing heart rate variability during dynamic changes in autonomous nervous system balance induced by atropine and propranolol. Fourier and wavelet transforms were applied to sequences of heart rate intervals in six subjects receiving increasing doses of atropine and propranolol. At the lowest doses of atropine administered, heart rate variability increased, followed by a progressive decrease with higher doses. With the first dose of propranolol, there was a significant increase in heart rate variability, which progressively disappeared after the last dose. Wavelet transform gave significantly better quantitative analysis of heart rate variability than did Fourier transform during autonomous nervous system adaptations induced by both agents and provided novel temporally localized information.

Fourier transform; atropine; propranolol; autonomous nervous system


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