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Respiratory movement patterns during vocalizations at 7 and 11 months of age

Kevin J Reilly1, Christopher A Moore

  • 1Department of Speech-Language Pathology and Audiology, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA. k.reilly@neu.edu

Journal of Speech, Language, and Hearing Research : JSLHR
|August 13, 2008
PubMed

Insights

As infants develop, their chest walls become less compliant, leading to faster and more controlled breathing movements during vocalizations. This enhanced control aids in speech development.

Area of Science:

  • Developmental biology
  • Respiratory physiology
  • Speech science

Background:

  • Chest wall compliance decreases significantly during infancy.
  • Neuromuscular control of respiration matures during early development.

Purpose of the Study:

  • To investigate chest wall movement modulation during vocalization in infants.
  • To examine developmental changes in rib cage and abdominal kinematics.
  • To correlate these changes with decreasing chest wall compliance.

Main Methods:

  • Recorded rib cage and abdominal kinematics in 7- and 11-month-old infants during vocalization.
  • Utilized principal component analysis (PCA) to analyze kinematic data.
  • Compared movement patterns between the two age groups.

Main Results:

  • Infants at 11 months showed shorter fundamental periods in principal component (PC) waveforms compared to 7-month-olds.
  • Variance from unidirectional movement patterns decreased, while modulated movement patterns increased in 11-month-olds.
  • Abdomen and rib cage movements better predicted vocalization duration in older infants.

Conclusions:

  • Findings support the hypothesis that reduced chest wall compliance enhances movement modulation and neuromuscular control.
  • Developing infants exhibit improved control over respiratory movements for vocalization.
  • This study highlights the interplay between chest wall mechanics and vocal development.
Abstract

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