Analysis of respiratory state and accessory inspiratory muscle activity by spike count processing of surface electromyogram
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概要
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Although numerous studies using surface electromyography (EMG) have been conducted, few have examined the relationship between respiratory state and respiratory muscle activity. The location of the respiratory muscles deep in the neck makes their EMG signal-to-noise ratio poor and quantitative measurement difficult. To resolve this problem, we monitored an accessory inspiratory muscle in the neck with the Bagnoli-2 EMG system that effectively eliminates noise. From the data obtained we analyzed the relationship between respiratory state and inspiratory muscle activity by focusing on spike count per minute. Participants were four men and one woman, none of whom had impaired respiratory function. We recorded EMG data for 1 min using four electrodes placed on the sternocleidomastoid muscle. Measurements were made for the following sequence of respiratory states : (1) rest, (2) deep breathing, (3) tachypnea, and (4) rest again. For each respiratory state, we computed the spike count per minute by adding the spike counts obtained in 0.1s increments. EMG of the activity most frequently observed in a preliminary experiment during maximum voluntary contraction (MVC) was observed and normalized according to the maximum value observed in tachypnea. For analysis, we compared the normalized values of the examined respiratory states. Relative to 100% for tachypnea, the average MVC ratio was 48.9 ± 9.98% for rest, 66.7 ± 12.9% for deep breathing, and 61.5 ± 18.1% for rest again. In all participants, the MVC ratio for tachypnea was significantly different from the MVC ratios for the other respiratory states. No significant differences in MVC ratio were found between rest, deep breathing, and rest again. By determining the spike count per minute, we quantitatively evaluated the relationship between respiratory state and inspiratory muscle activity. This method enabled us to compare the MVC ratios for rest, deep breathing, tachypnea, and rest again uncompromised by noise, and the results showed an activity pattern suggesting that the sternocleidomastoid muscle is an inspiratory muscle.
- 大阪歯科学会の論文
著者
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Kotani Junichiro
Department of Anesthesiology, Osaka Dental University
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Kotani Junichiro
Department Of Anesthesiology Osaka Dental University
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Kato Yasuhiko
Department Of Anesthesiology Osaka Dental University
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Kanazumi Masahiko
Graduate School of Dentistry (Department of Anesthesiology), Osaka Dental University
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