Thesis or Dissertation Fatigue resistance to experimental contraction in human craniofacial muscle groups

生駒, 朋子 

Aim: Hyperactivity or abnormal contractions of craniofacial muscles, e.g. bruxism, are traditionally linked to pain and unpleasantness in the active muscles. The aim of this study was to investigate the effects of different standardized craniofacial muscle contractions on perceived muscle symptoms. Materials and Methods: Sixteen healthy volunteers (seven men, mean ± SEM, 25.7 ± 1.4 years and nine women, 24.9 ± 2.3 years) performed six 5-minutes bouts of 20% maximal voluntary experimental contraction task of jaw-closing (Jaw), orbicularis-oris (O-oris), and orbicularis-oculi (O-oculi) muscles. Participants rated their perceived pain, unpleasantness, fatigue, and stress levels before, during, and after the contraction tasks on 0-10 Numeric Rating Scales (NRS). Each muscle contraction task (= one session) was separated by at least one week and the order of performed sessions was randomised in each participant. Data were analysed using repeated measurements ANOVAs. Results: All muscle contraction tasks evoked significant increases in NRS scores of pain, unpleasantness, fatigue, and stress (P < .034). Jaw contractions were associated with higher NRS scores compared to O-oris and O-oculi contractions (P < .005) without differences between O-oris and O-oculi (P > .063). All craniofacial muscle symptoms had disappeared within a day (P > .469). Conclusion: The results showed that submaximal static contractions of different craniofacial muscle groups could evoke mild to moderate levels of transient symptoms. Further studies are warranted to better understand the contribution of specific craniofacial muscle groups for the characteristic presentation of musculoskeletal pain conditions in the head.
Hokkaido University(北海道大学). 博士(歯学)

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