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Oral diadochokinesis is related to decline in swallowing function among community-dwelling Japanese elderly: a cross-sectional study

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Abstract

Background

Since oral organs function in the first stage of the swallowing process, it is possible that decline in swallowing function can be partly related to oral frailty.

Aims

The purpose of this study was to investigate the association between swallowing function and oral function among community-dwelling elderly Japanese and to propose cut-off values for screening of decline in swallowing function.

Methods

A total of 188 participants were included in the analysis. The number of present teeth and functioning teeth were counted. Bacteria counts in tongue coat, oral wettability, tongue pressure, oral diadochokinesis (ODK), masticatory ability and bite force were examined. Swallowing function was assessed using the 10-item Eating Assessment Tool (EAT-10). Receiver operating characteristic curves were used to determine the cut-off points of each oral function parameter. A logistic regression model was performed to determine the combination of parameters with the highest accuracy for differentiating decline in swallowing function from normal.

Results

Subjects with ODK /pa/ sound < 6.2 times/second had higher prevalence of swallowing problems than those with 6.2 times/second or more. EAT-10 scores of one or more were significantly related to older age (≥ 71 years old; odds ratio [OR] 4.321) and reduced ODK /pa/ sound (< 6.2 times/second; OR 2.914).

Conclusions

Among community-dwelling elderly Japanese, those who were suspected of having decline in swallowing function had lower oral function than those who did not, and the cut-off values were 71 years of age and ODK /pa/ sound 6.2 times/s.

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Acknowledgements

The authors specially thank all participants of the study.

Funding

This work was supported by Japan Society for the Promotion of Science, JSPS KAKENHI grant number 17K12046 and 17H04421.

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Authors and Affiliations

  1. Department of Preventive Dentistry, Okayama University Hospital, 2-5-1 Shikata-cho, Kitaku, Okayama, 700-8558, Japan

    Noriko Takeuchi

  2. Department of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama, 700-8558, Japan

    Nanami Sawada, Daisuke Ekuni & Manabu Morita

Authors
  1. Noriko Takeuchi
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  2. Nanami Sawada
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  3. Daisuke Ekuni
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  4. Manabu Morita
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Contributions

NT and MM designed the study, and wrote the initial draft of the manuscript. NT and DE contributed to analysis and interpretation of data, and assisted in the preparation of the manuscript. NS have contributed to data collection. All authors have approved the final version of the manuscript.

Corresponding author

Correspondence to Noriko Takeuchi.

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Conflict of interest

The authors declare that they have no conflict of interest.

Ethics approval

The study protocol was approved by the Ethics Committee of the Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences (No. 1708-028).

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All participants provided written informed consent for study participation.

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Takeuchi, N., Sawada, N., Ekuni, D. et al. Oral diadochokinesis is related to decline in swallowing function among community-dwelling Japanese elderly: a cross-sectional study. Aging Clin Exp Res 33, 399–405 (2021). https://doi.org/10.1007/s40520-020-01547-7

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  • DOI: https://doi.org/10.1007/s40520-020-01547-7

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