title: Effect of mirthful laughter on vascular function.
abstract: In contrast to the well-established scientific evidence linking negative emotional states (e.g., depression, anxiety, or anger) to increased risk for cardiovascular disease, much less is known about the association between positive emotional states (e.g., laughter, happiness) and cardiovascular health. We determined the effects of mirthful laughter, elicited by watching comic movies, on endothelial function and central artery compliance. Seventeen apparently healthy adults (23 to 42 years of age) watched 30 minutes of a comedy or a documentary (control) on separate days (crossover design). Heart rate and blood pressure increased significantly while watching the comedy, whereas no such changes were seen while watching the documentary. Ischemia-induced brachial artery flow-mediated vasodilation (by B-mode ultrasound imaging) increased significantly after watching the comedy (17%) and decreased with watching the documentary (-15%). Carotid arterial compliance (by simultaneous application of ultrasound imaging and applanation tonometry) increased (10%) significantly immediately after watching the comedy and returned to baseline 24 hours after the watching, whereas it did not change significantly throughout the documentary condition. Comedy-induced changes in arterial compliance were significantly associated with baseline flow-mediated dilation (r = 0.63). These results suggest that mirthful laughter elicited by comic movies induces beneficial impact on vascular function.
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan. jun.sugawara@aist.go.jp
authors.forename: Jun
authors.initials: J
authors.lastname: Sugawara
authors.forename: Takashi
authors.initials: T
authors.lastname: Tarumi
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Tanaka
mesh_terms: D000328:Adult; D000465:Algorithms; D001341:Autonomic Nervous System / Q000502:physiology; D001794:Blood Pressure; D001916:Brachial Artery / Q000000981:diagnostic imaging / Q000502:physiology; D002339:Carotid Arteries / Q000000981:diagnostic imaging / Q000502:physiology; D016022:Case-Control Studies; D003187:Compliance; D003971:Diastole; D004730:Endothelium, Vascular / Q000000981:diagnostic imaging* / Q000502:physiology*; D005260:Female; D006339:Heart Rate; D006801:Humans; D007845:Laughter; D008297:Male; D012016:Reference Values; D013599:Systole; D014463:Ultrasonography; D014664:Vasodilation