Function of scalene muscles under conditions of quiet breathing and inspiratory resistive load |
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| Authors: | E. V. Shurygina |
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| Affiliation: | (1) Department of Pharmacology and Microbiology, Medical Faculty, Petrozavodsk State University, USSR |
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| Abstract: | Low-threshold slow motor units in feline scalene muscle generated spontaneous discharges (6–8 imp/sec) during resting ventilation, which were independent of the respiration cycle. Under conditions of resistive load, activity of these motor units and its electromyographic pattern changed from tonic towards phasic type, synchronized with the inspiration phase. Removal of the load restored the initial pattern of activity. Clear dependency of activity transformations on respiratory load implies a functional modulation of respiratory neural drive to the scalene muscles and the role of these muscles in compensation of inspiratory load. Translated fromByulleten' Eksperimental'noi Biologii i Meditsiny, Vol. 128, No. 12, pp. 623–626, December 1999 |
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| Keywords: | scalene muscles motor units inspiratory resistive load accessory respiratory muscles |
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