Activation of human inspiratory muscles in an upside-down posture
Activation of human inspiratory muscles in an upside-down posture
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DOI：
10.1016/j.resp.2015.05.012
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发表时间：
2016-06-01
影响因子：
2.3
通讯作者：
Butler, Jane E.
中科院分区：
文献类型：
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作者：
Hudson, Anna L.;Joulia, Fabrice;Butler, Jane E.
在安静呼吸期间，强制性吸气肌的激活在时间和幅度上不同。为了验证这一假设，这种协调激活可以修改，我们确定了倒立姿势的效果相比，站立和仰卧。受试者（n=14）通过胸壁和腹部周围带有校准电感带的呼吸速度计呼吸。记录斜角肌的表面肌电活动（EMG）。在一个由6名受试者组成的亚组中测量小腿肌肉肌电图和食管胃压力。进行安静呼吸和标准肺功能操作。倒置体位降低了呼气末肺容量。安静呼吸时，在相同的吸气流量和潮气量下，与站立位相比，倒置位的胸腔贡献减少，腹部贡献增加，经颅压摆幅增加一倍（p < 0.05）。尽管如此，脚膈肌电图没有变化，而斜角肌肌电图减少了一半（p
During quiet breathing, activation of obligatory inspiratory muscles differs in timing and magnitude. To test the hypothesis that this coordinated activation can be modified, we determined the effect of the upside-down posture compared with standing and lying supine. Subjects (n=14) breathed through a pneumotachometer with calibrated inductance bands around the chest wall and abdomen. Surface electromyographic activity (EMG) was recorded from the scalene muscles. Crural diaphragmatic EMG and oesophageal and gastric pressures were measured in a subset of six subjects. Quiet breathing and standard lung function manoeuvres were performed. The upside-down posture reduced end-expiratory lung volume. During quiet breathing, for the same inspiratory airflow and tidal volume, ribcage contribution decreased, abdominal contribution increased and transdiaphragmatic pressure swing doubled in the upside-down posture compared to standing (p < 0.05). Despite this, crural diaphragm EMG was unchanged, whereas scalene muscle EMG was reduced by half (p