Vocalization and breathing were studied in 40 healthy young children, including 5 boys and 5 girls at each, of ages of 18, 24, 30, and 36 months. A variable inductance plethysmograph was used to obtain estimates of volume changes of the rib cage, abdomen, and lung, as well as estimates of selected temporal features of the breathing cycle. Results indicated that breathing behavior was influenced by height and age, but not by vocalization type or sex. Such behavior was found to be highly variable, demonstrating that these young children had multiple degrees of freedom of performance available to accomplish the aeromechanical drive required.
Bibliographical noteFunding Information:
Acknowledgment: This work was supported in part by National Multipurpose Research and Training Center Grant DC-01409 from the National Institute on Deafness and Other Communication Disorders. We are indebted to Dr. Lynn Taussig for allowing us to use facilities in the Department of Pediatrics, College of Medicine, University of Arizona, Tucson. We also want to thank the pediatric pulmonary technicians and student research assistants who aided in data acquisition and analysis. This article is dedicated to Arthur Siebens, MD, in memory of his compassion for patients, his creative research, and his dedication to the mentoring of junior faculty.