According to findings presented to a meeting of the American Heart Association in New Orleans, blood vessel diameters increased 26 percent on average compared to their normal baseline measurements when volunteers listened to music they liked for half an hour and narrowed six percent when they listened to heavy metal music they didn't like.

See "Music to your ears is music for your heart, too - Hearing favorite tunes helps blood vessels dilate, researchers find" http://www.msnbc.msn.com/id/27666479/.

-Bob

interesting stuff!

i bet this side effect would be exaggerated with some cardio (aka picado runs!)