Trevisan Maria Elaine, Boufleur Jalusa, Soares Juliana Corrêa, Haygert Carlos Jesus Pereira, Ries Lilian Gerdi Kittel, Corrêa Eliane Castilhos Rodrigues
Department of Physical Therapy, Federal University of Santa Maria, Santa Maria, RS, Brazil; Graduate Program of Human Communication Diseases, Federal University of Santa Maria, Santa Maria, RS, Brazil.
Graduate Program of Human Communication Diseases, Federal University of Santa Maria, Santa Maria, RS, Brazil.
J Electromyogr Kinesiol. 2015 Jun;25(3):463-8. doi: 10.1016/j.jelekin.2015.03.006. Epub 2015 Apr 6.
The purpose of this study was to evaluate the electromyographic activity of the accessory inspiratory muscles and the diaphragmatic amplitude (DA) in nasal and mouth-breathing adults. The study evaluated 38 mouth-breathing (MB group) and 38 nasal-breathing (NB group) adults, from 18 to 30years old and both sexes. Surface electromyography (sEMG) was used to evaluate the amplitude and symmetry (POC%) of the sternocleidomastoid (SCM) and upper trapezius (UT) muscles at rest, during nasal slow inspiration at Lung Total Capacity (LTC) and, during rapid and abrupt inspiration: Sniff, Peak Nasal Inspiratory Flow (PNIF) and Maximum Inspiratory Pressure (MIP). M-mode ultrasonography assessed the right diaphragm muscle amplitude in three different nasal inspirations: at tidal volume (TV), Sniff and inspiration at LTC. The SCM activity was significantly lower in the MB group during Sniff, PNIF (p<0.01, Mann-Whitney test) and MIP (p<0.01, t-test). The groups did not differ during rest and inspiration at LTC, regarding sEMG amplitude and POC%. DA was significantly lower in the MB group at TV (p<0.01, Mann-Whitney) and TLC (p=0.03, t-test). Mouth breathing reflected on lower recruitment of the accessory inspiratory muscles during fast inspiration and lower diaphragmatic amplitude, compared to nasal breathing.
本研究的目的是评估成年口呼吸者和鼻呼吸者辅助吸气肌的肌电活动以及膈肌幅度（DA）。该研究评估了38名年龄在18至30岁之间的成年口呼吸者（MB组）和38名成年鼻呼吸者（NB组），涵盖了不同性别。采用表面肌电图（sEMG）来评估胸锁乳突肌（SCM）和上斜方肌（UT）在静息状态下、肺总量（LTC）时的鼻慢吸气过程中以及快速急促吸气（嗅吸、最大鼻吸气流量[PNIF]和最大吸气压力[MIP]）时的幅度和对称性（POC%）。M型超声检查评估了右膈肌在三种不同鼻吸气状态下的幅度：潮气量（TV）时、嗅吸时和LTC时的吸气。在嗅吸、PNIF（p<0.01，曼-惠特尼检验）和MIP（p<0.01，t检验）过程中，MB组的SCM活动显著降低。在静息状态和LTC吸气过程中，两组在sEMG幅度和POC%方面没有差异。在TV（p<0.01，曼-惠特尼检验）和肺总量（TLC）（p=0.03，t检验）时，MB组的DA显著降低。与鼻呼吸相比，口呼吸反映出在快速吸气过程中辅助吸气肌的募集减少以及膈肌幅度降低。
