To determine the effects of positions of the trunk, head and neck on the swallowing function in the Japanese elderly.
Subjects included 19 elderlies who participated in the preventive long-term care service, and 16 users of day-care services. The subjects were asked to take the three times, and the findings of each and accumulated time necessary for saliva swallowing were evaluated for both two different positions, sitting and semi-sitting, and three postural changes of head and neck, including thirty-degree flexion, zero and thirty-degree extension. Each positional and head-neck postural effects on the swallowing time were evaluated.
The zero-degree head-neck sitting position was found to be the shortest, while thirty-degree head-neck extension in semi-sitting position was longest time for swallowing. In thirty-degree head-neck postures, no difference was observed in the values of the sitting and semi-sitting positions.
When evaluating the swallowing function, both the sitting position with the zero degree of head and neck, and semi-sitting position with 30-degree head and neck seemed to enable accurate assessments.
Even for the bedridden, as long as the head-neck were flexed, swallowing function could be evaluated as accurately as in the traditional sitting-position evaluation.
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