title: Effect of expiratory resistive loading in expiratory muscle strength training on orbicularis oris muscle activity.
abstract: [Purpose] The purpose of this study was to elucidate the effect of expiratory resistive loading on orbicularis oris muscle activity. [Subjects] Subjects were 23 healthy individuals (11 males, mean age 25.5±4.3 years; 12 females, mean age 25.0±3.0 years). [Methods] Surface electromyography was performed to measure the activity of the orbicularis oris muscle during maximum lip closure and resistive loading at different expiratory pressures. Measurement was performed at 10%, 30%, 50%, and 100% of maximum expiratory pressure (MEP) for all subjects. The t-test was used to compare muscle activity between maximum lip closure and 100% MEP, and analysis of variance followed by multiple comparisons was used to compare the muscle activities observed at different expiratory pressures. [Results] No significant difference in muscle activity was observed between maximum lip closure and 100% MEP. Analysis of variance with multiple comparisons revealed significant differences among the different expiratory pressures. [Conclusion] Orbicularis oris muscle activity increased with increasing expiratory resistive loading.
authors.affiliation: Department of Rehabilitation, Tokushima Prefecture Naruto Hospital, Japan ; Graduate School of Rehabilitation, Kobe Gakuin University, Japan.
authors.forename: Yukio
authors.initials: Y
authors.lastname: Yanagisawa
authors.affiliation: Research Institute for Health and Exercise Sciences, Mukogawa Women's University, Japan.
authors.forename: Yoshimi
authors.initials: Y
authors.lastname: Matsuo
authors.affiliation: Faculty of Rehabilitation, Kobe Gakuin University, Japan.
authors.forename: Hisato
authors.initials: H
authors.lastname: Shuntoh
authors.affiliation: Department of Internal Medicine, Tokushima Prefecture Naruto Hospital, Japan.
authors.forename: Noriaki
authors.initials: N
authors.lastname: Horiuchi
keywords: Expiratory resistance load; Orbicularis oris muscle; Surface electromyography