Excessive anterior cervical muscle tone affects hyoid bone kinetics during swallowing in healthy individuals

Yasuhiro Yamazaki, Haruka Tohara, Koji Hara, Ayako Nakane, Yoko Wakasugi, Kohei Yamaguchi, Shunsuke Minakuchi Department of Gerodontology, Tokyo Medical and Dental University, Tokyo, Japan Purpose: This study aimed to determine whether excessive neck muscle tone affects hyoid bone kinetics during...

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Autores principales:	Yamazaki Y, Tohara H, Hara K, Nakane A, Wakasugi Y, Yamaguchi K, Minakuchi S
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2017
Materias:	Dysphagia Swallow Muscle tone Hyoid bone Infra hyoid muscles Supra hyoid muscles Geriatrics RC952-954.6
Acceso en línea:	https://doaj.org/article/893cee1e34f54755aa05f028a2e91cff
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spelling	oai:doaj.org-article:893cee1e34f54755aa05f028a2e91cff2021-12-02T01:09:22ZExcessive anterior cervical muscle tone affects hyoid bone kinetics during swallowing in healthy individuals1178-1998https://doaj.org/article/893cee1e34f54755aa05f028a2e91cff2017-11-01T00:00:00Zhttps://www.dovepress.com/excessive-anterior-cervical-muscle-tone-affects-hyoid-bone-kinetics-du-peer-reviewed-article-CIAhttps://doaj.org/toc/1178-1998Yasuhiro Yamazaki, Haruka Tohara, Koji Hara, Ayako Nakane, Yoko Wakasugi, Kohei Yamaguchi, Shunsuke Minakuchi Department of Gerodontology, Tokyo Medical and Dental University, Tokyo, Japan Purpose: This study aimed to determine whether excessive neck muscle tone affects hyoid bone kinetics during swallowing using videofluorography (VF) in an unnatural posture in healthy individuals. Subjects and methods: Subjects were 28 healthy adults (12 men, 16 women; mean age, 39.75±9.50 years) without any history or present complaints of swallowing disorders. We first established the participant’s posture a reclining wheelchair that was adjusted to a 30-degree angle with the headrest (without excessive neck muscle tone) or without headrest (with excessive neck muscle tone), used an electromyogram above the mylohyoid muscle to represent the suprahyoid muscles and above the sternohyoid muscle to represent the infrahyoid muscles to confirm neck muscle tone, and then conducted VF of swallowing measurements. Videofluorographic images were obtained when 5 mL of 50% (w/v) barium sulfate was being swallowed, and hyoid bone coordinate (the resting position and the elevated position), extent of horizontal and vertical hyoid bone elevation, as well as duration and velocity of hyoid bone elevation were evaluated (x-axis and y-axis coordinates for the resting position of hyoid bone are referred to as Xr and Yr, respectively; those for the elevated hyoid bone position induced during swallowing are referred to as Xs and Ys, respectively). Results: In the resting position of the hyoid bone, the Yr coordinates in those with excessive neck muscle tone were significantly lower than in those without excessive neck muscle tone. Vertical hyoid bone elevation and hyoid bone elevation velocity were significantly higher with excessive neck muscle tone than without excessive neck muscle tone, whereas horizontal elevation showed no significant differences. Conclusion: Our findings suggest that the generation of neck muscle tone due to inappropriate posture may encourage hyoid depression and increase the extent of hyoid bone elevation, thereby increasing the risk of aspiration. Keywords: dysphagia, swallow, muscle tone, hyoid bone, infrahyoid muscles, suprahyoid musclesYamazaki YTohara HHara KNakane AWakasugi YYamaguchi KMinakuchi SDove Medical PressarticleDysphagiaSwallowMuscle toneHyoid boneInfra hyoid musclesSupra hyoid musclesGeriatricsRC952-954.6ENClinical Interventions in Aging, Vol Volume 12, Pp 1903-1910 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Dysphagia Swallow Muscle tone Hyoid bone Infra hyoid muscles Supra hyoid muscles Geriatrics RC952-954.6
spellingShingle	Dysphagia Swallow Muscle tone Hyoid bone Infra hyoid muscles Supra hyoid muscles Geriatrics RC952-954.6 Yamazaki Y Tohara H Hara K Nakane A Wakasugi Y Yamaguchi K Minakuchi S Excessive anterior cervical muscle tone affects hyoid bone kinetics during swallowing in healthy individuals
description	Yasuhiro Yamazaki, Haruka Tohara, Koji Hara, Ayako Nakane, Yoko Wakasugi, Kohei Yamaguchi, Shunsuke Minakuchi Department of Gerodontology, Tokyo Medical and Dental University, Tokyo, Japan Purpose: This study aimed to determine whether excessive neck muscle tone affects hyoid bone kinetics during swallowing using videofluorography (VF) in an unnatural posture in healthy individuals. Subjects and methods: Subjects were 28 healthy adults (12 men, 16 women; mean age, 39.75±9.50 years) without any history or present complaints of swallowing disorders. We first established the participant’s posture a reclining wheelchair that was adjusted to a 30-degree angle with the headrest (without excessive neck muscle tone) or without headrest (with excessive neck muscle tone), used an electromyogram above the mylohyoid muscle to represent the suprahyoid muscles and above the sternohyoid muscle to represent the infrahyoid muscles to confirm neck muscle tone, and then conducted VF of swallowing measurements. Videofluorographic images were obtained when 5 mL of 50% (w/v) barium sulfate was being swallowed, and hyoid bone coordinate (the resting position and the elevated position), extent of horizontal and vertical hyoid bone elevation, as well as duration and velocity of hyoid bone elevation were evaluated (x-axis and y-axis coordinates for the resting position of hyoid bone are referred to as Xr and Yr, respectively; those for the elevated hyoid bone position induced during swallowing are referred to as Xs and Ys, respectively). Results: In the resting position of the hyoid bone, the Yr coordinates in those with excessive neck muscle tone were significantly lower than in those without excessive neck muscle tone. Vertical hyoid bone elevation and hyoid bone elevation velocity were significantly higher with excessive neck muscle tone than without excessive neck muscle tone, whereas horizontal elevation showed no significant differences. Conclusion: Our findings suggest that the generation of neck muscle tone due to inappropriate posture may encourage hyoid depression and increase the extent of hyoid bone elevation, thereby increasing the risk of aspiration. Keywords: dysphagia, swallow, muscle tone, hyoid bone, infrahyoid muscles, suprahyoid muscles
format	article
author	Yamazaki Y Tohara H Hara K Nakane A Wakasugi Y Yamaguchi K Minakuchi S
author_facet	Yamazaki Y Tohara H Hara K Nakane A Wakasugi Y Yamaguchi K Minakuchi S
author_sort	Yamazaki Y
title	Excessive anterior cervical muscle tone affects hyoid bone kinetics during swallowing in healthy individuals
title_short	Excessive anterior cervical muscle tone affects hyoid bone kinetics during swallowing in healthy individuals
title_full	Excessive anterior cervical muscle tone affects hyoid bone kinetics during swallowing in healthy individuals
title_fullStr	Excessive anterior cervical muscle tone affects hyoid bone kinetics during swallowing in healthy individuals
title_full_unstemmed	Excessive anterior cervical muscle tone affects hyoid bone kinetics during swallowing in healthy individuals
title_sort	excessive anterior cervical muscle tone affects hyoid bone kinetics during swallowing in healthy individuals
publisher	Dove Medical Press
publishDate	2017
url	https://doaj.org/article/893cee1e34f54755aa05f028a2e91cff
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Excessive anterior cervical muscle tone affects hyoid bone kinetics during swallowing in healthy individuals

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