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Purpose: The purpose of this study was to investigate the effects of tongue-strengthening exercise (TSE) on tongue strength and effortful swallowing pressure in young healthy adults. Method: Thirteen young healthy volunteers (six men, seven women; M[subscript age] = 20.5 ± 0.5 years) performed 8 weeks of isometric TSE 3 days per week. A tongue pressure measurement device was used to measure maximum isometric tongue pressure (MITP) and conduct the TSE, and a tactile sensor system attached to the hard palate was used to measure effortful swallowing pressure. MITP and effortful swallowing pressure were measured at baseline, after 4 and 8 weeks of training, and at 4 and 8 weeks after the last training session to examine the detraining effects. Results: The results indicated that both MITP and effortful swallowing pressure increased significantly from baseline to 8 weeks after training. Although the improved MITP significantly decreased at 4 and 8 weeks after training cessation, no detraining effect was observed for effortful swallowing pressure. Conclusions: TSE is an effective method for increasing tongue pressure in wide tongue-palate contact areas during effortful swallow. The effortful swallowing pressure gained with TSE appears to be maintained for at least eight nontraining weeks.

Background: High‐density surface electromyography (HD‐sEMG) has enabled non‐invasive analysis of motor unit (MU) activity and recruitment, but its application to swallowing‐related muscles is limited. Objective: We aimed to investigate the utility of HD‐sEMG for quantitatively evaluating the MU recruitment characteristics of the suprahyoid muscles during tongue elevation. Methods: We measured the sEMG activity of the suprahyoid muscles of healthy participants during tongue elevation using HD‐sEMG. Maximum voluntary contraction (MVC) was measured, followed by data collection during sustained and ramp‐up tasks to capture suprahyoid muscle activity. Changes in the temporal/spatial MU recruitment patterns within individual suprahyoid muscles were analysed. Results: This study enrolled 16 healthy young adults (mean age: 27.8 ± 5.3 years; eight males and eight females). Increasing muscle force corresponded to a decrease in modified entropy and correlation coefficient and an increase in the coefficient of variation. No significant differences were observed between male and female participants. Conclusion: The results of this study, consistent with those observed in other muscles, such as the vastus lateralis muscle, suggest that HD‐sEMG is a valuable and reliable tool for quantitatively evaluating MU recruitment in the suprahyoid muscles. This measurement technique holds promise for novel assessments of swallowing function. [ABSTRACT FROM AUTHOR]