The influence of affective state on respiratory muscle activity

Clinical Physiology and Functional Imaging
Juliette Westbrook, Victoria MacBean

Abstract

Measures of neural respiratory drive through the use of electromyography of the parasternal intercostal muscles (EMGpara) are accurate markers of respiratory load and are reflective of pulmonary function. A previous observation of a significant reduction in EMGpara from a first to second measurement occasion was attributed to participants' acclimatization to the laboratory environment and a reduction in anxiety. This study therefore aimed to investigate whether manipulation of participants' affective state would influence EMGpara and related variables. Healthy adult participants underwent measurement of EMGpara and respiratory flow and volume during exposure to four conditions: no stimulus, music, and tense and calm videos. Respiratory rate (RR), raw neural respiratory drive index (rawNRDI, the product of EMGpara in microvolts and RR) and minute ventilation (VE) differed significantly across conditions: RR and VE were significantly higher in the tense condition than all other conditions (all P<0·05); rawNRDI was higher in the tense compared to the calm video condition (P = 0·03). There was also a significant relationship between EMGpara and subjective tension ratings (measured via visual analogue scale) in the tense condition (...Continue Reading

References

Feb 27, 2004·Nordic Journal of Psychiatry·Rie Lambaek MikkelsenKurt Bjerregaard Stage
Jun 9, 2004·Psychosomatic Medicine·Wayne J KatonElizabeth McCauley
Jun 30, 2012·The European Respiratory Journal·Philip H QuanjerUNKNOWN ERS Global Lung Function Initiative
Oct 18, 2014·The European Respiratory Journal·Caroline J JolleyJohn Moxham
Feb 15, 2017·Experimental Physiology·Victoria MacBeanGerrard F Rafferty
Sep 8, 2017·Frontiers in Physiology·Roland W EsserAndreas von Leupoldt

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