Misha Nili1, Syed Abidi1, Stephania Serna1, Simon Kim1, Heather Edgell2,3. 1. School of Kinesiology and Health Sciences, York University, 355 Bethune College, 4700 Keele St, Toronto, ON, M3J 1P3, Canada. 2. School of Kinesiology and Health Sciences, York University, 355 Bethune College, 4700 Keele St, Toronto, ON, M3J 1P3, Canada. edgell@yorku.ca. 3. Muscle Health Research Centre, York University, Toronto, ON, Canada. edgell@yorku.ca.
Abstract
PURPOSE: Deep breathing assesses autonomic function; however, many researchers/clinicians do not account for hyperventilation, brain blood flow or blood pressure. METHODS: Men and women (with/without oral contraceptives) participated. women participated during low and high hormone phases of the menstrual cycle. Blood pressure, end-tidal carbon dioxide, middle cerebral artery velocity and cerebrovascular resistance were assessed. RESULTS: Deep breathing decreased end-tidal carbon dioxide and middle cerebral artery velocity while increasing cerebrovascular resistance in all participants; blood pressure decreased in men. There were no influences of menstrual cycle or oral contraceptives. CONCLUSIONS: Men have different autonomic responses to deep breathing compared to women.
PURPOSE: Deep breathing assesses autonomic function; however, many researchers/clinicians do not account for hyperventilation, brain blood flow or blood pressure. METHODS:Men and women (with/without oral contraceptives) participated. women participated during low and high hormone phases of the menstrual cycle. Blood pressure, end-tidal carbon dioxide, middle cerebral artery velocity and cerebrovascular resistance were assessed. RESULTS: Deep breathing decreased end-tidal carbon dioxide and middle cerebral artery velocity while increasing cerebrovascular resistance in all participants; blood pressure decreased in men. There were no influences of menstrual cycle or oral contraceptives. CONCLUSIONS:Men have different autonomic responses to deep breathing compared to women.
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