Related Experiment Video
Updated: Mar 23, 2026

Method to Obtain Pattern of Breathing in Senescent Mice through Unrestrained Barometric Plethysmography
Published on: April 28, 2020
Approximate Entropy of Respiratory Movements in Human Newborns during Different Sleep States
Hiroo Tamaki1, Mazumi Miura2, Sachiko Nakamoto1
1Department of Pathobiological Science and Technology, School of Health Science, Tottori University Faculty of Medicine, Yonago 683-8503, Japan.
Abstract:
Previous studies have reported that the respiratory cycle of healthy newborns is more irregular during active sleep. This study aimed to apply non-linear analysis to examine the irregularity of respiratory movement in newborns at different sleep states. The respiratory movement signals from an abdominal band during quiet and active sleep were analyzed using approximate entropy (ApEn). The breathing interval of active sleep was significantly shorter than that of quiet sleep [1.30 (0.17) s vs. 1.58 (0.11) s; (P < 0.03)]. The ApEn of respiratory movements during active sleep were significantly larger than that during quiet sleep [0.785 (0.135) s vs. 0.678 (0.083) s; (P < 0.05)]. We found that the ApEn of respiratory movement in healthy newborns could detect irregularities in respiration during sleep.
More Related Videos
Related Concept Videos
Respiratory Volumes and Capacities I
Entropy
Entropy
When an ideal gas expands isothermally, the disorder in the gas increases. From the molecular perspective, the gas molecules have more volume to move around in.
Consider an infinitesimal step in the expansion, which...
Sleep-Wake Cycles
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
Assessment of Ventilation II: Respiratory Depth and Rhythm
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
To assess respiratory depth, observe the degree of chest excursion or movement:
Physical Assessment of the Respiratory Tract II: Inspection
Chest Configuration
The chest configuration...

