title: The Effect of Teeth Clenching on Dynamic Balance at Jump-Landing: A Pilot Study.
abstract: The aim of this study was to analyze the effect of teeth clenching on dynamic balance at jump landing. Twenty-five healthy subjects performed jump-landing tasks with or without teeth clenching. The first 3 trials were performed with no instruction; subsequently, subjects were ordered to clench at the time of landing in the following 3 trials. We collected the data of masseter muscle activity by electromyogram, the maximum vertical ground reaction force (vGRFmax) and center of pressure (CoP) parameters by force plate during jump-landing. According to the clenching status of control jump-landing, all participants were categorized into a spontaneous clenching group and no clenching group, and the CoP data were compared. The masseter muscle activity was correlated with vGRFmax during anterior jump-landing, while it was not correlated with CoP. In comparisons between the spontaneous clenching and the no clenching group during anterior jump-landing, the spontaneous clenching group showed harder landing and the CoP area became larger than the no clenching group. There were no significant differences between pre- and postintervention in both spontaneous clenching and no clenching groups. The effect of teeth clenching on dynamic balance during jump-landing was limited.
authors.affiliation: 1 Tokyo Medical and Dental University.
authors.forename: Tomomasa
authors.initials: T
authors.lastname: Nakamura
authors.affiliation: 1 Tokyo Medical and Dental University.
authors.forename: Yuriko
authors.initials: Y
authors.lastname: Yoshida
authors.affiliation: 1 Tokyo Medical and Dental University.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Churei
authors.affiliation: 1 Tokyo Medical and Dental University.
authors.forename: Junya
authors.initials: J
authors.lastname: Aizawa
authors.affiliation: 1 Tokyo Medical and Dental University.
authors.forename: Kenji
authors.initials: K
authors.lastname: Hirohata
authors.affiliation: 1 Tokyo Medical and Dental University.
authors.forename: Takehiro
authors.initials: T
authors.lastname: Ohmi
authors.affiliation: 1 Tokyo Medical and Dental University.
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Ohji
authors.affiliation: 1 Tokyo Medical and Dental University.
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Takahashi
authors.affiliation: 1 Tokyo Medical and Dental University.
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Enomoto
authors.affiliation: 1 Tokyo Medical and Dental University.
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Ueno
authors.affiliation: 1 Tokyo Medical and Dental University.
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Yagishita
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D002012:Bruxism; D004576:Electromyography; D005260:Female; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D010865:Pilot Projects; D059385:Plyometric Exercise; D004856:Postural Balance; D055815:Young Adult
keywords: center of pressure; dynamic balance; electromyogram; ground reaction force; teeth clenching