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[Biologic rhythm of respiratory rate in the first trimester of life].

This study was designed to address the following objectives: 1) To record the respiratory rate in a population of newborns and infants. 2) To verify the existence of a rhythm in each population group, as well as the organization and maturing process of these rhythms. 3) To determine the possible influence of environmental factors on these rhythms. The study population consisted of the following groups and ages: A) 1 day (21 cases); B) 7 (15 cases); C) 15 (10 cases); D) 30 (17 cases); E) 60 (17 cases); F) 90 (18 cases). Respiratory rate was continuously monitored and recorded, as well as environmental light, noise and temperature. Rhythmometric analysis of the data was done by simple Cosinor test and analysis of variance. The zero amplitude test showed statistically significant differences in the circadian rhythm of groups E and F (p < 0.005). An ultradian rhythm of 3 hours was detected in groups D and F. Environmental factors also showed a circadian rhythm. The appearance of an ultradian rhythm suggest the maturation in a rhythm. To evaluate physiological parameters, reference to time series must be considered.