Relationships Among Rheological, Sensory Texture, and Swallowing Pressure Measurements of Hydrocolloid-Thickened...

Area of Science:

• Food Science and Technology
• Biomedical Engineering
• Swallowing Physiology

Background:

• Dysphagia necessitates thickened fluids to prevent aspiration.
• Current rheological assessments of thickeners lack direct correlation with sensory perception and swallowing biomechanics.
• Understanding these relationships is crucial for optimizing dysphagia diets.

Purpose of the Study:

• To investigate the interrelationships between rheological properties, sensory texture, and swallowing pressures in hydrocolloid-thickened fluids.
• To determine how different hydrocolloids and viscosities affect fluid perception and swallowing dynamics.
• To inform the selection of optimal thickeners for individuals with dysphagia.

Main Methods:

• Prepared fluids thickened with 15 hydrocolloids to target viscosities of 300 cP (nectar-like) and 1500 cP (thin honey-like).
• Measured rheological properties, including flow behavior index (n) and consistency coefficient (k).
• Assessed sensory texture attributes (e.g., thickness, stickiness, mouth coating) and recorded swallowing pressures.

Main Results:

• Sensory properties like thickness and stickiness positively correlated with the flow behavior index (n) in nectar-like fluids.
• In thin honey-like fluids, sensory attributes correlated positively with the n value.
• Higher shear thinning (lower n, higher k) correlated with reduced perceived thickness and adhesiveness.
• Swallowing pressures negatively correlated with the consistency coefficient (k).

Conclusions:

• Fluid rheology significantly influences sensory perception and swallowing pressures in thickened liquids.
• Shear-thinning fluids (lower n, higher k) may offer a balance between swallow safety and palatability for dysphagia patients.
• Findings support the development of hydrocolloids that provide desirable rheological profiles for improved dysphagia management.