Effect of Expiratory Resistive Loading in Expiratory Muscle Strength Training on Orbicularis Oris Muscle Activity

• Published in: Journal of Physical Therapy Science Vol. 26; no. 2; pp. 259 - 261
• Main Authors: Matsuo, Yoshimi, Yanagisawa, Yukio, Shuntoh, Hisato, Horiuchi, Noriaki
• Format: Journal Article
• Language: English
• Published: Japan The Society of Physical Therapy Science 01.02.2014
• Subjects: Expiratory resistance load; Orbicularis oris muscle; Original; Surface electromyography; Orbicularis oris muscle; Expiratory resistance load; Surface electromyography
• ISSN: 0915-5287; 2187-5626; 2187-5626
• DOI: 10.1589/jpts.26.259

[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.