Document Detail

Respiratory movement patterns during vocalizations at 7 and 11 months of age.
MedLine Citation:
PMID:  18695025     Owner:  NLM     Status:  MEDLINE    
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.
Kevin J Reilly; Christopher A Moore
Related Documents :
10546335 - Developmental changes in imitation from television during infancy.
20712745 - Imprinted numbers: newborn chicks' sensitivity to number vs. continuous extent of objec...
19296725 - Pauses and intonational phrasing: erp studies in 5-month-old german infants and adults.
14656515 - The early origins of goal attribution in infancy.
21506965 - Infant sporotrichosis in northeast china: a report of 15 cases.
8470665 - Risk of childhood cancer for infants with birth defects. ii. a record-linkage study, io...
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2008-08-11
Journal Detail:
Title:  Journal of speech, language, and hearing research : JSLHR     Volume:  52     ISSN:  1092-4388     ISO Abbreviation:  J. Speech Lang. Hear. Res.     Publication Date:  2009 Feb 
Date Detail:
Created Date:  2009-01-29     Completed Date:  2009-03-17     Revised Date:  2014-05-29    
Medline Journal Info:
Nlm Unique ID:  9705610     Medline TA:  J Speech Lang Hear Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  223-39     Citation Subset:  IM    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Abdomen / growth & development,  physiology
Biomechanical Phenomena
Child Language
Larynx / growth & development,  physiology
Motor Activity / physiology
Phonation / physiology*
Principal Component Analysis
Respiratory Mechanics / physiology*
Ribs / growth & development,  physiology
Verbal Behavior / physiology*
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  What do people who stutter want--fluency or freedom?
Next Document:  Circulating tumour cell (CTC) counts as intermediate end points in castration-resistant prostate can...