Li Qiang, Li Wanxin, Hori Kazuhiro, Murakami Kazuhiro, Maeda Yoshinobu, Chen Yongjin, Ono Takahiro
State Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Key Laboratory of Stomatology, Department of General Dentistry and Emergency, School of Stomatology, The Fourth Military Medical University, Xi'an, 710032, China.
Division of Comprehensive Prosthodontics, Niigata University Graduate School of Medical and Dental Sciences, Niigata, 951-8514, Japan.
Odontology. 2025 Sep 13. doi: 10.1007/s10266-025-01205-2.
Body posture plays an important role in the normal oropharyngeal swallowing process. We aimed to clarify the effects of trunk angle on the biomechanics of the tongue, hyoid, and suprahyoid and infrahyoid muscles during normal oropharyngeal swallowing. For this purpose, fifteen healthy male participants (aged 27.7 ± 1.8 years) were recruited. They swallowed 15 ml of water in three random trunk angles (90°, 60°, 30°), and tongue pressure, hyoid bone movement, and the activity of the suprahyoid and infrahyoid muscles were monitored simultaneously by a non-invasive sensing system. Then, the temporal sequence as well as the parameters such as duration, peak value, and interval of the above-mentioned oropharyngeal structural motions were assessed. Results showed that the temporal sequence of tongue pressure, hyoid motion, and myoelectric activities during oropharyngeal swallowing was stable without any variation among the three postures. As the body gradually inclined, the onset and offset of the hyoid stationary phase and the offset of hyoid movement were delayed, and the hyoid elevation phase was prolonged (p < 0.05). No significant differences were detected for any of the parameters of tongue pressure (p > 0.05) except for tongue pressure duration at the anterior part (p < 0.05). In addition, no significant postural effects were observed for the duration, peak value, and electromyographic area of the suprahyoid muscle or infrahyoid muscle (p > 0.05). These findings suggest that trunk angle had no effect on the biomechanical sequence of the tongue, hyoid, and muscles during oropharyngeal swallowing in healthy adults, and the oropharyngeal structures will accommodate and finely regulate according to body posture.
身体姿势在正常口咽吞咽过程中起着重要作用。我们旨在阐明躯干角度对正常口咽吞咽过程中舌、舌骨以及舌骨上肌群和舌骨下肌群生物力学的影响。为此，招募了15名健康男性参与者（年龄27.7±1.8岁）。他们在三个随机的躯干角度（90°、60°、30°）下吞咽15毫升水，同时通过非侵入性传感系统监测舌压力、舌骨运动以及舌骨上肌群和舌骨下肌群的活动。然后，评估上述口咽结构运动的时间顺序以及持续时间、峰值和间隔等参数。结果表明，口咽吞咽过程中舌压力、舌骨运动和肌电活动的时间顺序稳定，三种姿势之间无任何变化。随着身体逐渐倾斜，舌骨静止期的起始和结束以及舌骨运动的结束延迟，舌骨抬高期延长（p<0.05）。除前部舌压力持续时间外，舌压力的任何参数均未检测到显著差异（p>0.05）（p<0.05）。此外，舌骨上肌群或舌骨下肌群的持续时间、峰值和肌电面积未观察到显著的姿势效应（p>0.05）。这些发现表明，在健康成年人中，躯干角度对口咽吞咽过程中舌、舌骨和肌肉的生物力学顺序没有影响，口咽结构会根据身体姿势进行适应和精细调节。
