Related Experiment Videos
Perceptual contributions to optimization of breathing
Y Oku1, G M Saidel, M D Altose
1Department of Medicine, Case Western Reserve University, Cleveland, OH 44106-4915.
Annals of Biomedical Engineering
|September 1, 1993
Summary
Breathing optimization involves more than just energy cost; it includes reducing discomfort. This study suggests breathing discomfort integrates various inputs and may not directly estimate a cost function, but rather emerges from reflexes and behaviors.
Area of Science:
- Respiratory Physiology
- Neuroscience
- Human Sensation Perception
Background:
- Breathing optimization is crucial for survival and involves regulating energetic costs.
- The sensation of dyspnea (difficult breathing) is a key factor in breathing control.
- Poon's cost function models ventilation based on arterial PCO2, but its relation to breathing discomfort is unclear.
Purpose of the Study:
- To investigate the relationship between breathing discomfort and Poon's cost function.
- To explore the perceptual contributions to breathing optimization.
- To understand how chemical and mechanical feedback influence breathing control.
Main Methods:
- Development of a reflex control model for breathing.
- Conducting psychophysical studies to assess breathing discomfort.
- Analyzing the integration of chemical and mechanical inputs to the respiratory controller.
Main Results:
- Breathing discomfort integrates chemical and mechanical inputs, suggesting it's not a simple estimate of a cost function.
- A reflex control model can dynamically minimize cost functions like Poon's.
- Willful adjustments in ventilation influence breathing discomfort.
Conclusions:
- Ventilatory optimization likely arises from a combination of automatic reflexes and behavioral responses.
- Excitatory chemical and inhibitory neuromechanical feedbacks play a role in breathing regulation.
- Breathing discomfort is a complex sensation influencing ventilatory control beyond energetic cost.