The (human) respiratory rate at rest

Area of Science:

• Physiology
• Biophysics
• Mathematical Biology

Background:

• The precise determinants of resting spontaneous breathing rate remain incompletely understood, despite its fundamental nature.
• Evolutionary principles suggest physiological processes are optimized for economy, but this has not been fully applied to respiratory rate modeling.

Purpose of the Study:

• To develop a theoretical model for resting spontaneous breathing rate.
• To identify key physiological and physical parameters influencing breathing rate.
• To explain variations in breathing rate, such as between neonates and adults, through an economic lens.

Main Methods:

• Utilized physiological, physical, and mathematical methods.
• Derived a respiratory rate equation based on the principle of evolutionary economy.
• Employed secondary school level mathematics for the derivation.

Main Results:

• Developed an equation for respiratory rate incorporating organismal oxygen-production rate, lung resistance, static compliance, dead space, and inspiratory/expiratory timing.
• Calculated normal resting breathing rates for adult humans and newborn infants using literature data.
• Explained higher neonatal respiratory rates by their elevated oxygen-production rate and lower lung compliance.

Conclusions:

• The derived model provides a theoretical framework for understanding spontaneous quiet breathing.
• The model's parameters are not human-specific, suggesting potential applicability to various mammals.
• Further research and animal data are encouraged to validate and expand upon this theoretical concept, with potential applications in pulmonary diagnostics.