Respiratory Movement Patterns During Vocalizations at 7 and 11 Months of Age Purpose The present investigation was designed to study the modulation of abdomen and rib cage movements during vocalization over a period of development associated with rapid decreases in the compliance of the chest wall. Method Rib cage and abdominal kinematics were recorded during spontaneous vocalizations in 7- and ... Research Article
Research Article  |   February 01, 2009
Respiratory Movement Patterns During Vocalizations at 7 and 11 Months of Age
 
Author Affiliations & Notes
  • Kevin J. Reilly
    Northeastern University, Boston, MA
  • Christopher A. Moore
    National Institute on Deafness and Other Communication Disorders, Bethesda, MD
  • Contact author: Kevin J. Reilly, Department of Speech-Language Pathology and Audiology, Northeastern University, 360 Huntington Avenue, Boston, MA 02115. E-mail: k.reilly@neu.edu.
Article Information
Speech, Voice & Prosody / Speech / Research Articles
Research Article   |   February 01, 2009
Respiratory Movement Patterns During Vocalizations at 7 and 11 Months of Age
Journal of Speech, Language, and Hearing Research, February 2009, Vol. 52, 223-239. doi:10.1044/1092-4388(2008/06-0215)
History: Received November 22, 2006 , Revised July 9, 2007 , Accepted May 13, 2008
 
Journal of Speech, Language, and Hearing Research, February 2009, Vol. 52, 223-239. doi:10.1044/1092-4388(2008/06-0215)
History: Received November 22, 2006; Revised July 9, 2007; Accepted May 13, 2008
Web of Science® Times Cited: 5

Purpose The present investigation was designed to study the modulation of abdomen and rib cage movements during vocalization over a period of development associated with rapid decreases in the compliance of the chest wall.

Method Rib cage and abdominal kinematics were recorded during spontaneous vocalizations in 7- and 11-month old infants. Principal component analysis was used to represent each infant’s abdomen and rib cage traces as the weighted sum of a small number of principal component (PC) waveforms.

Results The fundamental periods of infants' PC waveforms in the 11-month group were significantly shorter than those in the 7-month group. In addition, the variance contributed by PCs describing unidirectional patterns of respiratory movement decreased in the 11-month group, whereas the variances contributed by PCs describing modulated patterns of movement increased. Lastly, the extent to which abdomen and rib cage movements predicted the duration of corresponding vocalizations also increased significantly in the 11-month group compared with the 7-month group.

Conclusions The findings of the present study were consistent with the hypothesis that decreases in the compliance of the chest wall result in more rapid modulation of chest wall movements and greater control of those movements by the developing neuromuscular system.

Acknowledgments
This work was supported by Grants T32 DC00033, R01 DC00822, and F31 DC00295 from the National Institute on Deafness and Other Communication Disorders; the Talaris Research Institute; and the Institute for Learning and Brain Sciences (formerly called The Center for Mind, Brain, and Learning) at the University of Washington. We are also grateful for the support that we received from the University of Washington, Boston University, and Northeastern University.
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