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Low-frequency respiratory rhythms in infants during the first six months of life
1Johannes-Müller Institute of Physiology, University Hospital Charité, Humboldt-University of Berlin, 10117 Berlin, Germany.
Insights
This study found distinct low-frequency respiratory rhythms (LFR) and periodic breathing (PB) in infants. These rhythms, crucial for infant respiration, are controlled and function independently.
Area of Science:
- Neonatal physiology
- Respiratory control mechanisms
Background:
- Infant respiration exhibits complex patterns, including low-frequency rhythms.
- Understanding these rhythms is crucial for assessing infant respiratory health.
Purpose of the Study:
- To investigate the characteristics of low-frequency components in infant respiration.
- To differentiate between low-frequency rhythms (LFR) and periodic breathing (PB).
Main Methods:
- Analysis of respirograms, respiratory frequency, and amplitude in healthy term infants (0-6 months).
- Utilized fast Fourier transformation to analyze undisturbed quiet sleep and periodic breathing segments.
- Determined peak frequency (PF) in the 0.04-0.2 Hz range.
Main Results:
- Identified stable low-frequency rhythms (LFR) from 0.045 to 0.067 Hz, correlated with amplitude changes.
- Periodic breathing (PB) exhibited peak frequencies (PF) between 0.056 and 0.1 Hz.
- LFR frequency was significantly lower than PB frequency.
Conclusions:
- Low-frequency rhythms (LFR) and periodic breathing (PB) are distinct respiratory phenomena in infants.
- LFR and PB are independently controlled and operate separately.
- These findings contribute to understanding infant respiratory control.
Abstract:
The aim of the study was to investigate characteristics of low-frequency components in respiration. Sixteen healthy term infants were examined from the first day up to the 6th month of life. The respirogram, instantaneous respiratory frequency and respiratory amplitude of undisturbed segments of quiet sleep phases and periodic breathing (PB) were analysed via fast Fourier transformation. The peak frequency (PF) in the low-frequency range (0.04-0.2 Hz) was determined. PF for PB ranged from 0.056 to 0.1 Hz. Further, low-frequency rhythms (LFR) of the respirogram, which were stable during the recordings as well as during development, were found ranging from 0.045 to 0.067 Hz. The LFR of the respirogram is correlated with rhythmic changes in the relationship between inspiratory and expiratory amplitudes. The frequency of the LFR was significantly lower than that of the PB. The data indicate that LFR and PB are low-frequency respiratory rhythms which are separately controlled and perform independently.