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Dissociation between diaphragmatic and rib cage muscle fatigue

Dissociation between diaphragmatic and rib cage muscle fatigue FITTING, J. Mr., T. D. BRADLEY, P. A. EASTON, M. J. LINCOLN, M. D. GOLDMAN, AND A. GRASSINO. Dissociation between and . J. Appl. Physiol. 64(3): 959-965, 1988~-To assess and its relationship to , we recorded the electromyogram (EMG) of the parasternal intercostals (PS), sternocleidomastoid (SM), and platysma with fine wire electrodes and the EMG of the diaphragm (DI) with an esophageal electrode. Six normal subjects were studied during inspiratory resistive breathing. Two different breathing patterns were imposed: mainly or mainly breathing. The development of was assessed by analysis of the high-to-low (H/L) ratio of the EMG. To determine the appropriate frequency bands for the PS and SM, we established their EMG power spectrum by Fourier analysis. The mean and SD for the centroid frequency was 312 -+ 16 Hz for PS and 244 & 48 Hz for SM. When breathing with the patterns, all subjects showed a fall in H/L of the DI and none had a fall in H/L of the PS or SM. During emphasis, four out of five subjects showed a fall in H/L of the PS and five out of six showed a fall in H/L of the SM. Four subjects showed no http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Physiology The American Physiological Society

Dissociation between diaphragmatic and rib cage muscle fatigue

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Publisher
The American Physiological Society
Copyright
Copyright © 1988 the American Physiological Society
ISSN
8750-7587
eISSN
1522-1601
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Abstract

FITTING, J. Mr., T. D. BRADLEY, P. A. EASTON, M. J. LINCOLN, M. D. GOLDMAN, AND A. GRASSINO. Dissociation between and . J. Appl. Physiol. 64(3): 959-965, 1988~-To assess and its relationship to , we recorded the electromyogram (EMG) of the parasternal intercostals (PS), sternocleidomastoid (SM), and platysma with fine wire electrodes and the EMG of the diaphragm (DI) with an esophageal electrode. Six normal subjects were studied during inspiratory resistive breathing. Two different breathing patterns were imposed: mainly or mainly breathing. The development of was assessed by analysis of the high-to-low (H/L) ratio of the EMG. To determine the appropriate frequency bands for the PS and SM, we established their EMG power spectrum by Fourier analysis. The mean and SD for the centroid frequency was 312 -+ 16 Hz for PS and 244 & 48 Hz for SM. When breathing with the patterns, all subjects showed a fall in H/L of the DI and none had a fall in H/L of the PS or SM. During emphasis, four out of five subjects showed a fall in H/L of the PS and five out of six showed a fall in H/L of the SM. Four subjects showed no

Journal

Journal of Applied Physiology – The American Physiological Society

Published: Mar 1, 1988

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