Automated measurement of the cyclic activity of respiratory muscles.

M. J. Drinnan, A. Murray, J. E. S. White, A. J. Smithson, G. J. Gibson, C. J. Griffiths

Research output: Contribution to journalArticlepeer-review


A microcomputer-based system developed for the automated analysis of the electromyogram (EMG) recorded from respiratory muscles in a variety of situations is described. In addition, an assessment of the performance of the system is presented, along with data relating intercostal EMG activity to ribcage movement in seated subjects. Studies were performed on sixteen normal subjects — non smokers, mean (± SD) age 31 (± 6) years, mean (± SD) mass 78 (± 8) kg — of which fifteen studies proved suitable for analysis. Each study lasted for a period of five minutes, during which time recordings of intercostal EMG, ribcage postero-anterior displacement (RCPA) and airflow were made. For every breath taken by each of the subjects, the peak integrated EMG activity (iEMGpeak) was measured both by hand and by the automated system. The automated and manual measurements of iEMGpeak, which ranged from 0.0 to 91.3 μV, differed by only −0.82 ± 3.34 μV (mean ± SD).

Original languageEnglish
Pages (from-to)477-483
Number of pages7
JournalMedical Engineering and Physics
Issue number6
Publication statusPublished - 1 Nov 1994
Externally publishedYes


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