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Chewing cycles in 4- and 5-year-old Down's syndrome children: a comparison of eating efficacy with normals
Insights
Children with Down syndrome (DS) chew similarly to their peers but take longer per bite. This prolonged chewing duration in DS children may stem from reduced chewing strength or difficulty with solid foods.
Area of Science:
- Pediatric feeding and swallowing disorders
- Developmental disabilities research
- Oral motor function assessment
Background:
- Children with Down syndrome (DS) often exhibit oral motor challenges impacting feeding.
- Understanding chewing mechanics is crucial for nutritional intake and development in children with DS.
Purpose of the Study:
- To compare chewing movement patterns in preschool-aged children with Down syndrome and typically developing children.
- To identify specific differences in chewing efficiency and duration between the two groups.
Main Methods:
- Measured chewing time, number of cycles, and time/cycle ratio in 26 children with Down syndrome (aged 4-5 years) and compared them to normal preschool children.
- Defined a chewing cycle as an upward and downward chin movement.
- Analyzed the impact of age, gender, and food type on chewing parameters.
Main Results:
- Chewing rate was comparable between children with Down syndrome and controls.
- The duration of chewing per bite was significantly longer in children with Down syndrome.
- Food type strongly influenced chewing measures, while age and gender did not.
- Time/cycle ratio proved an effective index for documenting chewing differences.
Conclusions:
- Children with Down syndrome exhibit prolonged chewing duration per bite, potentially due to reduced chewing vigor or difficulty with solid foods.
- The time/cycle ratio is a valuable metric for assessing chewing efficiency in this population.
- The contribution of sensory factors to these chewing differences remains an area for further investigation.
Abstract:
Chewing movements of Down's syndrome children were measured and compared with those of normal preschool children. Twenty-six Down's syndrome children were monitored: 14 were 4 (8 males, 6 females) and 12 were 5 years old (6 males, 6 females). Chewing movements were measured by time (in seconds), number of cycles, and a time/cycle ratio. A chewing cycle was defined as an upward and downward movement of the chin. The time/cycle ratio is the total time, from the moment food was placed in the mouth until the final swallow occurred, divided by the number of cycles counted for the same period. The children's ages and gender did not affect time, cycles, or the time/cycle ratio. However, the measures were strongly affected by the type of food eaten. Children with Down's syndrome chew at a rate comparable to that of normal children. However, the duration of chewing is significantly prolonged per bite of food. This may be attributed to these children's lack of chewing vigor or their inability, at the ages studied, to chew solid foods. Time/cycle ratios are an excellent index to document such differences. How much sensory differences or deficits contribute to these findings is not known.