Should you stop wearing neckties?- wearing a tight necktie reduces cerebral blood flow.
Deficits in flow are expected when jugular veins and carotid arteries are compressed. An evidence already exist that neckties increase intraocular pressure. To many professions, including those from the medical field in the USA, neckties are part of the dress code. A study conducted at Schleswig Holstein University, Kiel campus, included thirty volunteers who were divided into two groups: one wearing tight neckties and other without this “socially imposed semi-strangulation”. During a magnetic resonance imaging test and after tightening the necktie, a clear and statistically significant decrease in cerebral blood flow was observed. However, venous flow did not show any changes. The average decrease of venous flow was no more than 10%, which is not enough to cause evident symptoms.
Luddecke R, Lindner T, Forstenpintner J, Baron R, Jansen O, Gierthmuhlen J. Should you stop wearing neckties ?- wearing a tigh necktie reduces cerebral blood flow. Neuroradiology. 2018;60(8):861-4. http://doi.org/ 10.1007/s00234-018-2048-7.