Premium
Effects of intra‐oesophageal acid infusion and a stress task on masseter muscle activity and autonomic nervous activity in wakefulness
Author(s) -
MaedaIino Aya,
Fukushima Mika,
Sakoguchi Yoko,
Omure Haruhito,
Oishi Akihito,
Oga Yasuhiko,
FurukawaSainoki Minami,
Kanmura Shuji,
Ido Akio,
Miyawaki Shouichi
Publication year - 2020
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/joor.12947
Subject(s) - masseter muscle , autonomic nervous system , medicine , saline , anesthesia , parasympathetic nervous system , sympathetic nervous system , reflux , endocrinology , anatomy , heart rate , blood pressure , disease
Background Gastroesophageal reflux disease may be an important risk factor for awake bruxism. Additionally, it has been known that a psychological stress task affects masseter muscle activity, and autonomic nervous system (ANS) activity modulation induces masseter muscle activity. Objectives This study aimed to investigate whether task‐induced stress and experimental oesophageal acid infusion increase masseter muscle activity and alter ANS activity, compared to rest task and oesophageal saline infusion, respectively. Methods Polygraphic monitoring, consisting of electromyography of the masseter muscle and electrocardiography, was performed in 12 healthy adult men during 30‐min interventions with intra‐oesophageal saline or acid infusion, while reading a book quietly, as rest, and while performing calculation, as a stress task. Results At rest, masseter muscle activity and parasympathetic nervous system (PNS) activity during acid infusion were significantly higher ( P = .019) and lower ( P = .021) than during saline infusion, respectively. During saline infusion, both masseter muscle activity and sympathetic nervous system (SNS) activity or PNS activity while performing the calculation task were higher ( P = .022 and .012, respectively) or lower ( P = .007) than those during the reading task, respectively. In two‐way repeated‐measures ANOVA, intra‐oesophageal infusion (saline or acid) significantly affected masseter muscle activity ( P = .008) and PNS activity ( P = .021). However, performing tasks (reading or calculation) significantly affected only PNS activity ( P = .028). Conclusion Intra‐oesophageal acid infusion significantly increased masseter muscle activity and decreased PNS activity. In contrast, stress task not only significantly decreased PNS activity, but only modestly increased masseter muscle activity and SNS activity.