title: Influence of human jaw movement on cerebral blood flow.
abstract: Temporal changes in cerebral blood flow induced by jaw movement have yet to be investigated. To assess the influence of pattern and intensity of muscle contraction during jaw movement on task-induced change in cerebral blood flow, we performed bilateral transcranial Doppler ultrasound examination during clenching, gum chewing, and tooth tapping in healthy volunteers. A random-effects model analysis revealed a significant increase in middle cerebral artery blood flow velocity during clenching (high muscle activity) and gum chewing (moderate muscle activity), compared with the preceding rest period; however, such an increase was not detected during tooth tapping (low muscle activity). Cerebral blood flow was greater on the working side during the intensive isometric contraction of the masseter muscle in clenching. These results suggest that task-induced change in cerebral blood flow during jaw movement is influenced by the change in peripheral circulation evoked by muscle contraction.
authors.affiliation: Division of Oromaxillofacial Regeneration, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita City, Osaka, 565-0871, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Hasegawa
authors.forename: T
authors.initials: T
authors.lastname: Ono
authors.forename: K
authors.initials: K
authors.lastname: Hori
authors.forename: T
authors.initials: T
authors.lastname: Nokubi
mesh_terms: D000328:Adult; D001783:Blood Flow Velocity / Q000502:physiology; D001785:Blood Gas Monitoring, Transcutaneous; D002245:Carbon Dioxide / Q000097:blood; D002560:Cerebrovascular Circulation / Q000502:physiology*; D002638:Chewing Gum; D004576:Electromyography; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology; D008297:Male; D008334:Mandible / Q000502:physiology*; D008406:Masseter Muscle / Q000502:physiology*; D008409:Mastication / Q000502:physiology; D020768:Middle Cerebral Artery / Q000502:physiology; D009068:Movement; D009119:Muscle Contraction / Q000502:physiology; D010474:Percussion; D012815:Signal Processing, Computer-Assisted; D014070:Tooth / Q000502:physiology; D017585:Ultrasonography, Doppler, Transcranial
chemical_list: D002638:Chewing Gum; D002245:Carbon Dioxide