Abstract
Aspiration, which is often caused by an incompetent swallowing mechanism, is a serious disorder. One of the solutions for aspiration is using thickener or grated yam in liquid food. The aim of this study is to find the rheology of them and a relationship with swallowing. In this study, we made a extensional flow simulation of grated yam to find out a suitable rheological model, and we also took X-ray videofluorgroaphy (VF) using ten of liquids with different viscosities. We found out that the grated yam has a high extension viscosity and discussed the reason for safe swallowing. We also discussed the shear rate range of liquid food at oral and pharynx which can be used when making a thicken food.
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