Chase Venice View of the Navy Arsenal

The results were part of the ongoing Coronary Artery Risk Development in Young Adults Study (CARDIA), which is being carried out at four cities nationally.
This report focused on nearly 500 patients at the Chicago CARDIA site.
Participants were black and white men and women aged 35-47 years, measured initially in 2000-2001 and followed up in 2005-2006.
However, the wrist band is less disruptive to normal sleep than sleeping in a sleep lab, because there is no "first-night" effect -- the disruption of the normal sleep structure of a subject that is often seen with more intrusive testing.
The amount of calcium in the coronary arteries was measured by CT scanning of the heart.
Linking Zzz's and Heart Sleep was measured by a wrist band recording wrist movement on an initial Wednesday through Saturday night period.This wrist recorder is a very good measurement of time spent asleep -- nearly as good as sleep measured in a sophisticated sleep laboratory.