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KMID : 1145820200030020013
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Swallowing Rehabilitation
2020 Volume.3 No. 2 p.13 ~ p.20
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Changes in Swallowing-related Muscle Activation according to the Degree of Head Extension - A Pilot Study
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Oh Jong-Chi
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Abstract
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This study investigated changes in the suprahyoid and infrahyoid muscle activation levels during water swallowing, according to the degree of head extension. Six healthy adult women who have no swallowing problems participated in this study. The subjects were instructed to swallow 3 mL of water in three positions (erect posture, 30? head extension, and full head extension). As they did, the activation levels of the suprahyoid and infrahyoid muscles were measured using surface electromyography. When swallowing water in 30? and full extended head positions, the activation level of the suprahyoid muscles increased by 74.9% and 102.4%, respectively, compared to the level when in erect posture. However, the difference was not statistically significant (p=0.046, 0.028). The activation levels of the infrahyoid muscle when swallowing water while in the 30? and fully extended head positions were also increased by 32.6% and 47.2%, respectively, compared to those when in the erect posture. However, the difference was also not statistically significant (p=0.028, 0.028). The activation levels of the suprahyoid and infrahyoid muscles tends to increase when swallowing with respect to head extension angle; this could be considered in developing a systematic muscle strengthening program for patients with conditions involving swallowing-related muscle weakness. This was a preliminary study aimed to confirm the possibility and direction of future studies. A larger sample group should be investigated to confirm the activation levels of swallowing-related muscles as the angle of head extension increases.
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KEYWORD
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Deglutition disorders, Electromyography, Exercise, posture, Suprahyoid muscle
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