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Investigation of muscle activity in the suprahyoid and infrahyoid muscle groups during inspiratory muscle training Yuki Oshima 1 , Kazuki Eimoto 1 , Tomoki Nanto 2 , Naoki Sasanuma 1 , Yuki Uchiyama 3 , Kazuhisa Domen 3 1Department of Rehabilitation, Hyogo Medical University Hospital 2Department of Speech-Language-Hearing Therapy, Faculty of Rehabilitation, Morinomiya University of Medical Sciences 3Department of Rehabilitation Medicine, School of Medicine, Hyogo Medical University Keyword: 吸気筋訓練 , 嚥下機能 , 舌骨上筋群 , 舌骨下筋群 , 表面筋電図 , inspiratory muscle training , swallowing function , suprahyoid muscles , infrahyoid muscles , surface electromyography pp.151-161
Published Date 2026/9/15
DOI https://doi.org/10.11477/mf.134958280230030151

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  • Abstract
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 The purpose of this study was to compare suprahyoid and infrahyoid muscle activity during inspiratory muscle training (IMT) with that during expiratory muscle training (EMT) and conventional swallowing exercises, and to obtain basic evidence for applying IMT as strength training. Twenty healthy adults were recruited ; 18 were included in the final analysis. Maximal inspiratory and expiratory mouth pressures (PImax and PEmax) were measured, and loads were set at 25% and 75% of each value. Surface electromyography recorded suprahyoid and infrahyoid activity during the following conditions:75% PImax, 25% PImax, 75% PEmax, 25% PEmax, maximal mouth opening, the Mendelsohn maneuver, head-lift exercise. In the suprahyoid muscles, 75% PImax showed no significant differences compared with 75% PEmax, head-lift, or the Mendelsohn maneuver. In the infrahyoid muscles, 75% PImax was significantly higher than other IMT or EMT conditions (adjusted p < 0.001) and did not differ from head-lift, the Mendelsohn maneuver, or maximal mouth opening. These results suggest that IMT at 75% PImax may be applicable for strengthening both muscle groups.


Copyright © 2026, Japanese Association of Speech-Language-Hearing Therapists. All rights reserved.

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電子版ISSN 印刷版ISSN 1349-5828 日本言語聴覚士協会

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