Properties of hyoid muscle contraction during tongue lift measurement. (4th December 2019)

• Record Type: Journal Article
• Authors: Koshi, Naomi; Magara, Jin; Sakai, Shogo; Tsujimura, Takanori; Ono, Kazuhiro; Inoue, Makoto
• Is Part Of: Journal of oral rehabilitation. Volume 47:Number 3(2020)
• Page Start: 332
• Page End: 338
• Publication Date: 2019-12-04
• Subjects: infrahyoid muscles -- suprahyoid muscles -- surface electromyogram -- tongue lift movement -- tongue pressure; Dentistry -- Periodicals; Prosthodontics -- Periodicals; 617
• DOI: 10.1111/joor.12894
• Languages: English
• ISSNs: 0305-182X

Abstract

Abstract: Background: Tongue lift movement (TLM) task is considered a treatment strategy in dysphagic patients. However, there is no evidence of effect of sustained tongue movements on the related muscle contraction. Objectives: The present study aimed to characterise the properties and time‐dependent changes of the electromyographic (EMG) features of suprahyoid muscles during TLM. Methods: Twenty young healthy volunteers were instructed to perform TLM at maximum effort in either the anterior or the posterior position, during measurement of tongue pressure for 7 s. Supra‐ (S‐hyo) and infra‐hyoid (I‐hyo) EMGs were recorded. The area and power frequency of EMG burst and the area under the curve of tongue pressure were compared among the conditions: trials (1st, 2nd vs 3rd trials); anterior vs posterior TLM; and early vs late 3 s of each trial. Results: There was no difference in the tongue pressure among trials or between the early and late 3 s. Anterior tongue pressure was significantly higher than posterior tongue pressure ( P < .001). The area of I‐hyo EMG burst was significantly larger ( P = .044), and the power frequency of I‐hyo EMG burst was significantly smaller ( P = .042) during posterior TLM than anterior TLM. A significant difference in the power frequency of both EMG bursts was observed between early and late stages during both anterior ( P < .05) and posterior ( P < .01) TLM. Conclusion: Hyoid muscles may compensate for rapid fatigue of the tongue muscle to maintain tongue pressure by changing their activity pattern during tongue pressure generation.