Relationship Between Changes in EMG and Respiratory Sinus Arrhythmia in a Study of Relaxation Therapy for Asthma |
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Authors: | Paul M Lehrer Stuart M Hochron Tracy Mayne Susan Isenberg Ann Marie Lasoski Victor Carlson James Gilchrist Stephen Porges |
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Institution: | (1) UMDNJ—Robert Wood Johnson Medical School, Piscataway, New Jersey, 08854-5635;(2) Department of Psychiatry, Robert Wood Johnson Medical School, Piscataway, New Jersey, 08854-5635;(3) Rutgers—The State University, New Brunswick, New Jersey, 08903;(4) St. Elizabeth Medical Center, Dayton, Ohio, 45408;(5) University of Maryland, Baltimore, Maryland, 20814 |
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Abstract: | This paper reports the relationships among changes in cardiovagal activity, surface EMG, and measures of pulmonary function in a study of relaxation therapy for asthma. Changes in FEV
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/FVC were negatively correlated with those in cardiac interbeat interval, consistent with the hypothesis that relaxation-induced changes in airway function are mediated autonomically, with increased vagal tone and/or decreased sympathetic arousal producing bronchoconstriction. Contrary to Kotses's theory of a vagal-trigeminal reflex as mediator for relaxation-induced improvement in asthma, decreases in pulmonary function occurred during relaxation sessions, accompanied by increases in cardiovagal activity, and within-session changes in frontal EMG in the first session of training were positively associated with changes in a measure of pulmonary function (FEV1/FVC). However, consistent with this hypothesis, first-session frontalis EMG changes were positively associated with changes in respiratory sinus arrhythmia, and last-session changes in cardiac interbeat interval were positively associated with changes in FEV1/FVC. The results suggest that the immediate effects of generalized relaxation instruction can be associated with a parasympathetic rebound, which, in turn, may induce countertherapeutic changes in asthma. However, the effects of specific facial muscle relaxation remain uncelar. |
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Keywords: | asthma respiratory sinus arrhythmia relaxation vagal tone |
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