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Various techniques are available to practice deep breathing, whereas possible differential psychophysiological effects have not been investigated. We compared four deep breathing techniques and examined outcomes in blood pressure variability, respiratory sinus arrhythmia, baroreflex function, and emotional state. Healthy adult volunteers performed pursed\u2010lips breathing, left and right unilateral nostril breathing, and deep breathing with an inspiratory threshold load (loaded breathing), all at a frequency of 0.1\u00a0Hz (i.e., controlled breathing) and for three minutes each. Results showed that blood pressure variability was higher during loaded breathing versus other conditions and higher during pursed\u2010lips breathing versus left and right unilateral nostril breathing. Respiratory sinus arrhythmia was higher during loaded breathing versus other conditions and higher during pursed\u2010lips breathing versus left unilateral nostril breathing. The effect of breathing condition on respiratory sinus arrhythmia was mediated by alterations in blood pressure variability. There was no difference between the breathing conditions in baroreflex sensitivity or effectiveness. Participants rated pursed\u2010lips breathing as more calming and pleasant and with more sense of control (vs. other conditions). Overall, among the four tested deep breathing techniques, loaded breathing was associated with enhanced cardiovascular effects and pursed\u2010lips breathing with better emotional responses, while also enhancing cardiovascular effects (albeit less than loaded breathing). These findings can be informative in applying deep breathing techniques as self\u2010management interventions for health conditions, in which baroreceptors stimulation and autonomic and emotional modulations can be beneficial, such as pain and hypertension.<\/jats:p>","DOI":"10.1111\/psyp.13712","type":"journal-article","created":{"date-parts":[[2020,10,28]],"date-time":"2020-10-28T05:50:38Z","timestamp":1603864238000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":39,"title":["Psychophysiological responses to various slow, deep breathing techniques"],"prefix":"10.1111","volume":"58","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8674-450X","authenticated-orcid":false,"given":"Ali","family":"Gholamrezaei","sequence":"first","affiliation":[{"name":"Research Group Health Psychology Faculty of Psychology and Educational Sciences KU Leuven Leuven Belgium"},{"name":"Laboratory for Brain\u2010Gut Axis Studies Translational Research Center for Gastrointestinal Disorders Department of Chronic Diseases, Metabolism and Ageing KU Leuven Leuven Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0048-774X","authenticated-orcid":false,"given":"Ilse","family":"Van Diest","sequence":"additional","affiliation":[{"name":"Research Group Health Psychology Faculty of Psychology and Educational Sciences KU Leuven Leuven Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2718-2065","authenticated-orcid":false,"given":"Qasim","family":"Aziz","sequence":"additional","affiliation":[{"name":"Centre for Neuroscience, Surgery and Trauma Blizard Institute Wingate Institute of Neurogastroeneterology Barts and The London School of Medicine and Dentistry, Queen Mary University of London London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0437-6665","authenticated-orcid":false,"given":"Johan W. 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