Reliability of Suprahyoid and Infrahyoid Electromyographic Measurements during Swallowing in Healthy Subjects
10.34160/jkds.2021.11.2.007
- Author:
Myung Woo PARK
1
;
Dongheon LEE
;
Han Gil SEO
;
Tai Ryoon HAN
;
Jung Chan LEE
;
Hee Chan KIM
;
Byung-Mo OH
Author Information
1. Department of Rehabilitation Medicine, Seoul National University Hospital, Seoul, Korea
- Publication Type:Original Article
- From:
Journal of the Korean Dysphagia Society
2021;11(2):128-136
- CountryRepublic of Korea
- Language:English
-
Abstract:
Objective:To evaluate the reliability of suprahyoid and infrahyoid electromyography (EMG) measurement during swallowing.
Methods:In all, 10 healthy volunteers were evaluated for the following surface EMG (sEMG) parameters in the suprahyoid and infrahyoid muscles during swallowing: onset latency, offset latency, duration, peak latency, maximal amplitude during swallowing, and the area under curve (AUC) of the rectified EMG signal. The sEMG was recorded while the participants swallowed five times each of the four fluid volumes (saliva, 2 ml, 5 ml, and 20 ml of water), totaling to 20 swallows. Moreover, the intra-participant variability per parameter was evaluated using the coefficient of variation (CV).
Results:Suprahyoid muscles were activated 0.095 s (95% CI, 0.062-0.128) earlier than the infrahyoid muscles.Maximal amplitudes during the 20 ml swallow were 17.484 (−1.543-36.512) and 13.490 (1.254-25.727) μV higher than values obtained during the 2 ml swallow in the suprahyoid and infrahyoid muscles, respectively. Furthermore, the AUC of the rectified EMG signal increased with the volume of swallow in both muscle groups (P=0.003, suprahyoid; P＜0.002, infrahyoid). The intra-individual variabilities of offset latency, duration, and maximal amplitude were relatively low (＜30% CV) in both muscle groups with respect to other parameters. The assessment of each parameter using EMG was highly reliable, with an intraclass correlation coefficient of ＞0.8.
Conclusion:Among the variable sEMG parameters assessed, the offset latency, duration, and maximal amplitude were the least variable. Although reliability on the rater side showed good results, the swallow-to-swallow variability of the parameters need to be considered in swallowing studies using sEMG.
