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Speaking and breathing in high respiratory drive
E Fiona Bailey1, Jeannette D Hoit
1National Center for Neurogenic Communication Disorders, Tucson, AZ 85724-5051 USA. ebailey@u.arizona.edu
Journal of Speech, Language, and Hearing Research : JSLHR
|January 30, 2004
Summary
This study shows that during high respiratory drive, speech breathing in healthy individuals is influenced by both speaking and metabolic needs. Breathing behaviors adapt, with some differences in magnitude, and discomfort increases when speaking.
Area of Science:
- Respiratory Physiology
- Speech Science
- Neuroscience
Background:
- Pulmonary ventilation during speech integrates airflow for speaking and metabolic demands.
- Understanding the interplay between speech and breathing offers insights into shared respiratory control mechanisms.
Purpose of the Study:
- To investigate if healthy subjects display distinct breathing patterns during speech under high respiratory drive.
- To document subject perceptions of breathing and speaking under these conditions.
Main Methods:
- Ten healthy males participated, breathing in normal air and high CO2 environments.
- Magnetometers measured lung volume, rib cage and abdomen volumes, minute volume, breathing frequency, tidal volume, and inspiratory/expiratory durations and flows.
- Subjective perceptions were informally assessed.
Main Results:
- Chest wall kinematics during speech breathing in high drive showed similar patterns but different magnitudes in lung/rib cage volumes and airflow compared to normal conditions.
- Linguistic influences on breathing were present but less pronounced than under normal conditions.
- All subjects reported increased discomfort when speaking versus breathing in high respiratory drive.
Conclusions:
- In healthy individuals, speech breathing under high respiratory drive is continuously shaped by integrated linguistic and metabolic signals.
- A parallel-processing model is proposed to account for these observed breathing behaviors during speech.