Diaphragm electrical activity during negative lower torso pressure in quadriplegic men
- 1 September 1981
- journal article
- research article
- Published by American Physiological Society in Journal of Applied Physiology
- Vol. 51 (3), 654-659
- https://doi.org/10.1152/jappl.1981.51.3.654
Abstract
We recorded the diaphragm electromyogram (EMG) of quadriplegic men before and during exposure of the lower torso to continuous negative pressure, which caused shortening of the inspiratory muscles by expanding the respiratory system by one tidal volume. The moving-time-averaged diaphragm EMG was larger during expansion of the respiratory system. When we repeated the experiment with subjects who breathed through a mouthpiece, we found qualitatively similar EMG changes and little or no change in tidal volume or end-tidal CO2 partial pressure. When the pressure was applied or removed rapidly, changes in EMG occurred within one or two breaths. Because end-tidal CO2 partial pressure did not increase, and because the response was rapid, we suggest that the response results from proprioceptive, rather than chemoreceptive, reflexes. As most of these men had complete spinal lesions at C6 or C7 the afferent pathways are likely to be vagal or phrenic.This publication has 12 references indexed in Scilit:
- FUNCTION OF THE ISOLATED PACED DIAPHRAGM AND THE CERVICAL ACCESSORY MUSCLES IN C1-QUADRIPLEGICSPublished by Elsevier ,1979
- Muscle activity during chest wall restriction and positive pressure breathing in manRespiration Physiology, 1978
- Characteristics of inspiratory inhibition by phasic volume feedback in catsJournal of Applied Physiology, 1978
- Mechanics of the human diaphragm during voluntary contraction: staticsJournal of Applied Physiology, 1978
- A digital computer technique for analyzing respiratory muscle EMG'sJournal of Applied Physiology, 1977
- Vagal control of diaphragm timing in cat while breathing at elevated lung volumesRespiration Physiology, 1977
- Mechanics of the canine diaphragmJournal of Applied Physiology, 1976
- Proprioceptive innervation of the diaphragmThe Journal of Physiology, 1965
- A UNITARY ANALYSIS OF PULMONARY VOLUME RECEPTORSAmerican Journal of Physiology-Legacy Content, 1946
- Afferent impulses in the vagus and their effect on respirationThe Journal of Physiology, 1933