Blood Pressure 2 Heart Rate 2 Valsalva maneuver blood pressure 2 controlled study 2 heart rate 2 human 2 Adult 1 Article 1 Bayes Theorem 1 Bayes theorem 1 COVID-19 1 Cerebrovascular Circulation 1 Fatigue 1 Female 1 Humans 1 Inflammation Mediators 1 Male 1 Middle Aged 1 Orthostatic Intolerance 1 Quantitative Scale for Grading of Cardiovascular Autonomic Reflex Tests and Small Fibers from Skin Biopsies 1 Retrospective Studies 1 Valsalva Maneuver 1 adult 1 aortic baroreceptor 1 article 1 autacoid 1 autonomic dysfunction 1 blood 1 brain blood flow 1