Creation of Daily Exercises Applying Cervical Surface Electromyography to Prevent Dysphagia in the Elderly

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K19125
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 57050:Prosthodontics-related
• Research Institution: Okayama University
• Principal Investigator: Manda Yousuke 岡山大学, 医歯薬学域, 助教 (60794477)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 表面筋電図 / 舌後方部 / 咀嚼 / リハビリテーション

Outline of Final Research Achievements

In this study, muscle activities in the posterior part of the tongue during mastication and articulation were measured and analyzed. The results showed that the amount of muscle activity related to the movement of the posterior part of the tongue on the masticatory side was predominantly larger than that on the nonmasticatory side from the initial stage of mastication to just before swallowing during chewing of foods that require grinding. Furthermore, it was suggested that the tongue changes its activity depending on the physical properties of the food, and that the tongue is performing coordinated movements with the masseter muscle. Regarding the muscle activity during articulation, it was found that gender had a significant effect on the tongue pressure generated by articulation of syllables in which the posterior part of the tongue is raised, and that voice volume had a predominant effect on tongue pressure and muscle activity.

Free Research Field

補綴系歯学

Academic Significance and Societal Importance of the Research Achievements

本研究では咀嚼における舌の筋活動を左右両側で測定し評価しており，これまでにない試みである。その結果，硬固物を咀嚼する際，咀嚼側の舌は非咀嚼側と比較して嚥下直前まで優位に高い筋活動を示しており，硬固物の咀嚼が舌の筋機能維持に寄与する可能性がある事が示唆された。また，リハビリテーションによる筋機能への効果を評価する方法について，標準化の手法を検討した。これにより，舌筋のリハビリテーションの評価において筋電図が有効であることが示唆された。