Surface Electromyography for Evaluating the Effect of Aging on the Coordination of Swallowing Muscles.
Wei-Han Chang, Mei-Hui Chen, Jen-Fang Liu and 3 others
PMID 37106228WHAT IT FOUND
In healthy older adults, swallowing muscles coordinate less tightly as age increases, but only when swallowing a large 30 ml gulp.
Small sips showed no age-related change. This suggests stress testing with larger volumes is needed to detect early aging effects on swallowing coordination.
Key findings
01The timing gap between jaw muscle and throat muscle activity during a 30 ml water swallow was positively correlated with age, indicating less coordinated muscle contraction in older participants.
02No significant correlation between age and muscle coordination timing was found when participants swallowed smaller volumes of 3 ml or 15 ml.
03Participants who could not swallow 30 ml in one gulp were significantly older and more likely to be male than those who could, but their muscle coordination timing did not differ significantly from the single-swallow group.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
The study did not include a younger control group, so it is impossible to know if the observed changes are truly 'aging' or just normal variation in older adults. Dysphagia was screened using a bedside test (V-VST) rather than instrumental assessment (VFSS or FEES), so participants with mild, silent dysphagia may have been included. The sample size was small (75 participants) and the age distribution was skewed, with fewer participants over 70 years old. Data quality screening for EMG noise was subjective, potentially introducing bias. The 30 ml volume is a high stress test; results may not generalize to everyday swallowing volumes.
Declared interests
The study was funded by the Ministry of Science and Technology, Taiwan. No conflicts of interest were declared.
The easy way to misread this
Do not interpret the age-related increase in muscle timing gaps as a sign of clinical dysphagia or a need for intervention. The correlations were low-to-moderate, and the study included only healthy adults with no reported swallowing difficulties. These findings describe subtle physiological changes in normal aging, not a diagnostic marker for disease.