Syncope 
Also known as fainting, an information sheet compiled by NINDS, the National Institute of Neurological Disorders and Stroke.
http://www.ninds.nih.gov/health_and_medical/disorders/syncope_doc.htmAmerican Academy of Family Physicians
An article entitled: Exercise-Related Syncope in the Young Athlete: Reassurance, Restriction or Referral?
http://www.aafp.org/afp/991101ap/2001.html
American Heart Association
An explanation of what syncope is, neurally mediated syncope, AHA recommendations and further resources to related issues.
http://216.185.112.5/presenter.jhtml?identifier=4749
Cheltenham Syncope Clinic
Neurocardiogenic Syncope (also known as Vasovagal Syncope) and Carotid Sinus Syndrome are important, treatable, yet under-diagnosed causes of recurrent blackouts. Diagnosis and management of these conditions is explained in this website.
http://www.syncope.co.uk
NPR : 'In Defense of Fainting'
Writer William Loiseaux has done a bit of scientific, linguistic, cultural and historical research on the act of fainting. He's written a treatise of sorts on the topic. It's called "In Defense of Fainting," published in The American Scholar and reprinted here.
http://www.npr.org/programs/watc/features/2001/010624.indefenseoffainting.html
