Dysphagia Grand Rounds 2

This is the second Dysphagia Grand Rounds (DGR) research article we are reviewing, in February 2017. The goal of this study was to improve our understanding of liquid volume perception and the impact of age and gender. It is an open access article and can be downloaded free of cost using the link below. The webinar discussing this article, presented by Dr. Ianessa Humbert, will be released on February 28, 2017. Please read the article before watching the DGR 2 webinar to maximize your learning experience. 

Article
Oral Perception of Liquid Volume Changes with Age
Authors: Erin Kamarunas, Gary H. McCullough, Mark Mennemeier, and Tiffany Munn
Journal: Journal of oral rehabilitation. 2015;42(9):657-662

Download DGR 2 article herehttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC4578969/

Download DGR 2 Webinar here: 
http://dysphagiagrandrounds.yondo.com/playlist/dgr-2-february-2017/177

Abstract

Background
Bolus volume has been widely studied, and research has demonstrated a variety of physiologic impacts on swallowing and swallowing disorders. Oral perception of bolus volume has not, to our knowledge, been investigated in association with normal aging processes. Research suggests many sensory changes with age, some within the oral cavity, and changes in swallowing function with age have been defined. The role of perception in oropharyngeal deglutition with age requires further investigation.

Objective
To establish the psychophysical relationship between liquid volume and oral perception and examine changes with age.

Methods
Healthy young and older adults were prospectively assessed using a magnitude estimation task differentiating five volumes of water delivered randomly to the oral cavity.

Results
A fourfold increase in liquid volume is required by older participants to perceive an approximate twofold increase in the perception of volume compared with younger healthy adults.

Conclusion
Sensory receptors in the oral cavity provide a feedback loop that modulates the swallowing motor response so that it is optimal for the size and consistency of the bolus. Changes in perception of bolus volume with age are consistent with other perceptual changes and may provide valuable information regarding sensorineural rehabilitation strategies in the future.