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Dysphagia

, Volume 27, Issue 2, pp 162–177 | Cite as

Temporal Variability in the Deglutition Literature

  • Sonja M. Molfenter
  • Catriona M. Steele
Review Article

Abstract

A literature review was conducted on temporal measures of swallowing in healthy individuals with the purpose of determining the degree of variability present in such measures within the literature. A total of 46 studies that met inclusion criteria were reviewed. The definitions and descriptive statistics for all reported temporal parameters were compiled for meta-analysis. In total, 119 different temporal parameters were found in the literature. The three most-frequently occurring durational measures were upper esophageal sphincter opening, laryngeal closure, and hyoid movement. The three most-frequently occurring interval measures were stage transition duration, pharyngeal transit time, and duration from laryngeal closure-to-UES opening. Subtle variations in operational definitions across studies were noted, making the comparison of data challenging. Analysis of forest plots compiling descriptive statistical data (means and 95% confidence intervals) across studies revealed differing degrees of variability across durations and intervals. Two parameters (UES opening duration and the laryngeal closure-to-UES opening interval) demonstrated the least variability, reflected by small ranges for mean values and tight confidence intervals. Trends emerged for factors of bolus size and participant age for some variables. Other potential sources of variability are discussed.

Keywords

Deglutition Deglutition disorders Temporal Timing Duration Variability 

Notes

Acknowledgments

The first author has received funding for her doctoral studies from the Natural Sciences and Engineering Research Council (Canada) Create CARE program and the Ontario Student Opportunity Trust Fund. The second author holds a New Investigator award from the Canadian Institutes of Health Research. The authors acknowledge the support of Toronto Rehabilitation Institute which receives funding under the Provincial Rehabilitation Research Program from the Ministry of Health and Long-term Care in Ontario. The views expressed do not necessarily reflect those of the ministry.

Conflict of interest

The authors have no conflicts of interest to disclose.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.Swallowing Rehabilitation Research Laboratory, Toronto Rehabilitation InstituteUniversity Health NetworkTorontoCanada
  2. 2.University of TorontoTorontoCanada
  3. 3.Bloorview Research InstituteHolland Bloorview Kids RehabTorontoCanada

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