title: Synchronization of masseter activity patterns between the right and left sides during chewing in healthy young males.
abstract: Masseter activity patterns during chewing, which were quantitatively assessed using T50 values, were compared between the right and left sides of healthy young males. Surface electromyograms were recorded from both masseters, and each participant was asked to chew four different agar samples at his own pace across two separate sessions. The four agar samples, each possessing differing textural properties, consisted of two normal and two distinctive agar varieties. The Pearson's correlation coefficient was calculated for each pair of T50 values to evaluate the degree of synchronization of activity patterns between both masseters. A three-way analysis of variance revealed significant main effects of the 'participant' and 'experimental session' factors, but not of the 'test food'. The number of significant coefficients increased stepwise by increasing the number of chews per sequence. These results suggest the importance of the initial stages of chewing sequences in facilitating the synchronization of bilateral masseter activity patterns.
authors.affiliation: Department of Health and Nutrition, Niigata University of Health and Welfare , 1398 Shimami-cho, Kita-ku, Niigata 950-3198 , Japan and.
authors.forename: Yozo
authors.initials: Y
authors.lastname: Miyaoka
authors.forename: Ichiro
authors.initials: I
authors.lastname: Ashida
authors.forename: Hajime
authors.initials: H
authors.lastname: Iwamori
authors.forename: Shin-Ya
authors.initials: SY
authors.lastname: Kawakami
authors.forename: Yuko
authors.initials: Y
authors.lastname: Tamaki
authors.forename: Takako
authors.initials: T
authors.lastname: Yamazaki
authors.forename: Naoko
authors.initials: N
authors.lastname: Ito
mesh_terms: D000293:Adolescent; D000328:Adult; D004576:Electromyography; D005502:Food; D006801:Humans; D008297:Male; D008406:Masseter Muscle / Q000502:physiology*; D008409:Mastication / Q000502:physiology*; D055815:Young Adult
keywords: Activity pattern; adult; chewing side; masseter