The Nord-Trøndelag Health Study (The HUNT Study) is one of the largest health studies ever performed. It is a unique database of medical histories, both personal and family histories, collected during three intensive studies.

Atrial fibrillation has been validated in 3,200 subjects in part 3 of the Hunt study, and network members are currently investigating the associations between atrial fibrillation and lifestyle factors such as physical activity, obesity, alcohol intake and genetic variations.