Diaphragm Recruitment Increases during a Bout of Targeted Inspiratory Muscle Training

Medicine and Science in Sports and Exercise
Andrew H RamsookJordan A Guenette

Abstract

The extent to which the diaphragm is targeted during a bout of inspiratory muscle training (IMT) is unknown. The purpose of this study was to characterize the relative activation patterns of the diaphragm and extradiaphragmatic inspiratory muscles during a bout of IMT and to determine whether diaphragmatic recruitment can be increased by giving subjects specific diaphragmatic breathing instructions (IMTdi). Ten healthy men were instrumented with surface EMG electrodes on the sternocleidomastoid (EMGscm), scalenes (EMGsca), parasternal intercostals (EMGpic), and seventh intercostal space (EMG7ic). A multipair esophageal electrode catheter measured crural diaphragmatic EMG (EMGdi) and transdiaphragmatic pressure (Pdi). Trial 1 of IMT involved 25 dynamic inspiratory maneuvers at 40% of maximal inspiratory mouth pressure using a variable flow resistive loading device where subjects were free to choose their own inspiratory muscle recruitment strategy. Trial 2 involved the same procedures, but subjects were given specific instructions to actively recruit their diaphragm. Cervical magnetic stimulation of the phrenic nerves verified the absence of diaphragmatic fatigue before commencing the second trial. Compared with IMT, IMTdi resul...Continue Reading

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Citations

Nov 20, 2018·American Journal of Speech-language Pathology·Sally K GallenaJafar Vossoughi
May 15, 2018·The Journal of Physiology·Joseph F WelchA William Sheel
Jun 25, 2017·Experimental Physiology·Carli M PetersA William Sheel
Apr 24, 2018·Medicine and Science in Sports and Exercise·Yannick Molgat-SeonA William Sheel
Nov 13, 2020·The Journal of Physiology·Bruno ArchizaA William Sheel
Dec 29, 2020·Journal of Applied Physiology·Tim A HardyBryan J Taylor

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