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• W2135289521 abstract "Introduction. Snoring and obstructive sleep apnea (OSA) are associated with swallowing disorders, probably due to tissue trauma of the pharynx caused by snoring. Spontaneous swallowing (SS) is a frequent physiologic act, characterized by a complex and coordinated activation of many stomatognathic, pharyngeal, and laryngeal muscles. Surface electromyographic (sEMG) activation of the sub-mandibular muscles is strictly connected to the swallowing biomechanical events. The strongest relationship is between the elevation and the anterior displacement of the hyoid bone and the sEMG signal of the supra-hyoid muscles. Objective. To assess the characteristics of supra-hyoid muscle activity during SS condition in patients with moderate-severe OSA and healthy subjects. Eleven patients with untreated moderate–severe OSA diagnosed by polysomnography (GOSA) and 11 subjects without OSA signs or symptoms (GC) were analyzed. Simultaneous bilateral sEMG activity from supra-hyoid muscle were evaluated during SS of saliva. Each sEMG signal was filtered and rectified. The onset of swallowing was detected when the signal rose clearly above the preceding background activity. The end was scored when the signal returned to levels of background activity. Right and left signals were averaged. The temporal difference between the beginning and end of the swallowing act determined the deglutition time. For amplitude evaluations, a standardization of the signal was applied considering the maximum peak of saliva swallowing amplitude as 100%. The amplitude value was extracted for the initial and final events of each standardized signal. For the maximum peak, the time delay from the beginning was also detected. The t-test was calculated for each parameters, with significance level at 5%. Results. There was no difference regarding the age between groups (p = 0.23), instead BMI were different (p < 0.01). For the SS of saliva the GOSA showed greater mean values of initial (24% vs 15%, p < 0.01) and final (22% vs 16%, p = 0.02) standardized amplitude. Swallowing time duration was smaller, even if not statistically significant, in GOSA (0.855 vs 1.103 s, p = 0.08) with an anticipated maximum peak delay (0.357 vs 0.569 s, p = 0.05). Conclusion. SS in moderate–severe OSA patients was characterized by both intensity and temporal differences in supra-hyoid muscle activity with respect to healthy subjects. Further investigations are being performed to deepen the characterization of different OSA degree of severity. This work was supported in part by University of São Paulo – Protocol No. 11.1.21626.01.7 and the first author received a fellowship from Coordination of Improvement of Higher Education Personnel (CAPES), Brazil." @default.
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• W2135289521 date "2013-12-01" @default.
• W2135289521 modified "2023-10-17" @default.
• W2135289521 title "Assessment of surface EMG supra-hyoid muscle activity in apneic patients compared to healthy subjects. A pilot study" @default.
• W2135289521 doi "https://doi.org/10.1016/j.sleep.2013.11.285" @default.
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