Chemical Senses Advance Access originally published online on October 27, 2006
Chemical Senses 2007 32(2):119-128; doi:10.1093/chemse/bjl037
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The Influence of Taste on Swallowing Apnea, Oral Preparation Time, and Duration and Amplitude of Submental Muscle Contraction
1 Van der Veer Institute for Parkinson's and Brain Research, 66 Stewart Street, Christchurch, New Zealand 2 Department of Communication Disorders, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand 3 Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia 4 Christchurch Public Hospital, Private Bag 4710, Christchurch, New Zealand
Correspondence to be sent to: M.-L. Huckabee, Van der Veer Institute for Parkinson's and Brain Research, 66 Stewart Street, Christchurch, New Zealand. e-mail: Maggie-Lee.Huckabee{at}canterbury.ac.nz
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Abstract |
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Prior research has documented a modulating effect of taste on swallowing. We hypothesized that presentation of tastant stimuli would be a significant variable in swallowing–respiratory coordination, duration of oral bolus preparation, and submental muscle contraction. Twenty-three healthy females were presented with 1-cm3 gelatin samples flavored with 4 tastants of increasing intensities. Visual analogue scale ratings of perceived intensity of each were used to identify relative equivalent concentrations across the 4 tastants. Data were then collected during ingestion of 5 trials of the 4 equivalent tastants using measurements of nasal airflow and submental surface electromyography (sEMG) to record biomechanical measures. Chi-square analysis failed to identify a statistically significant influence of taste on the phase location of swallowing apnea. Repeated measures analysis of variance demonstrated significant taste effects for oral preparation time, submental sEMG amplitude, and duration (P < 0.02). Sweet tastants were prepared for a shorter time when compared with bitter tastants. Swallow duration for sour, salty, and bitter tastants were longer than sweet and neutral tastants. Sour tastants resulted in the greatest amplitude of submental muscle contraction during swallowing. This study supports existing research that found that sour substances were swallowed with more effort when compared with other tastes.
Key words: bitter, deglutition, salty, sour, surface electromyography, sweet
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