title: Increased cholinergic activity during gravitation-induced pre-syncope in man.
mesh_terms: D006112:Gravitation; D006439:Hemodynamics; D006801:Humans; D008150:Lower Body Negative Pressure; D013575:Syncope / Q000209:etiology* / Q000503:physiopathology; D014630:Vagus Nerve / Q000503:physiopathology