Purpose: To investigate the effects of tongue-strengthening exercise (TSE) based on exercise intensity on tongue strength and thickness in older adults with sarcopenic dysphagia.
Methods: Participants were randomly assigned to groups 1 and 2. Group 1 underwent TSE at an intensity of 80% 1-repetition maximum (1RM) for 90 times/day, 5 days/week, for 8 weeks. In contrast, group 2 performed TSE at an intensity of 50% 1RM for the same period and number of times as group 1. The outcome measures were tongue strength, thickness and dropout rate owing to exercise compliance.
Results: Tongue strength increased from 16.7 to 22.1 kPa in Group 1 (d = 2.97) and from 16.9 to 19.1 kPa in Group 2 (d = 1.18). Tongue thickness increased from 37.1 to 40.5 mm in Group 1 (d = 1.13) and from 37.9 to 38.8 mm in Group 2 (d = 0.31). Post-intervention, Group 1 achieved greater gains than Group 2 in both strength (+3.0 kPa, d = 1.46) and thickness (+1.7 mm, d = 0.56). Dropout rates were 26.7% in Group 1 and 6.7% in Group 2.
Conclusion: TSE with an intensity of 80% 1RM was more effective than 50% 1RM in increasing tongue strength and thickness in older adults with sarcopenic dysphagia, but showed a relatively high dropout rate. Thus, it is recommended to select and apply an appropriate exercise intensity.
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