Electrically induced mechanomyograms reflect inspiratory muscle strength in young or elderly subjects

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• 作者：Shogo Watanabe^a ; ^{watanabe1224@okayama-u.ac.jp} ; Ippei Nojima^b ; ^{nojima@met.nagoya-u.ac.jp} ; Yuuna Agarie^c ; ^{korottokoron@gmail.com} ; Tatsunori Watanabe^b ; ^{watanabe.tatsunori@h.mbox.nagoya-u.ac.jp} ; Shinichi Fukuhara^a ; ^d ; ^{fukuhara@mw.kawasaki-m.ac.jp} ; Takeshi Fujinaga^a ; ^{takety0525@s.okayama-u.ac.jp} ; Hisao Oka^a ; ^{hoka@okayama-u.ac.jp}
• 关键词：Mechanomyogram ; Respiratory muscle strength ; Electric stimulation ; Smoking
• 刊名：Respiratory Investigation
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：54
• 期：6
• 页码：436-444
• 全文大小：1014 K
• 卷排序：54

文摘

Respiratory muscle strength has been used as a tool for evaluating respiratory rehabilitation in chronic obstructive pulmonary disease. However, mouth pressure measurement evaluated by maximum expiratory mouth pressure (PEmax) or inspiratory mouth pressure (PImax) offers an indirect method for measuring respiratory muscle strength. We demonstrated the evaluation of diaphragm contractility using a mechanomyogram (MMG), which is the mechanical signal generated by the motion of the diaphragm induced by the electric stimulation of the phrenic nerve.MethodsStudy participants were 21 young and 20 elderly subjects with no symptoms of respiratory disease. The elderly subjects were divided into non-smoker or smoker groups. The smoker group was defined as subjects having a Brinkman Index of greater than 300. We measured basic spirometric parameters, mouth pressure (PEmax, PImax), and diaphragmatic MMG.ResultsDiaphragmatic MMG showed more clear contrast between young subjects and elderly non-smoker or smoker subjects than the conventional method for respiratory muscle contraction (PEmax, PImax). In addition, the diaphragmatic MMG strongly correlated with inspiratory muscle strength.ConclusionsDiaphragmatic MMG may reflect diaphragmatic contractility more directly and sensitively than the conventional method.