Leisure-time physical activity increases the risk of atrial fibrillation in men

A survey carried out at Oslo University Hospital between 1974 and 2003 showed that there was a graded independent increase in the risk of atrial fibrillation (AF) with increasing levels of physical activity in a population-based study among men with ostensibly no other heart disease. In women the data were inconclusive.Reseaschers found a strong, statistically highly significant relationship between the level of self-reported leisure-time physical activity and AF, defined as new-onset prescription of flecainide in men.

The classification of physical activity was:1. Sedentary: Reading, watching TV, or other sedentary activity.

2. Moderate: Walking, cycling, or other forms of exercise at least 4 hours per week (including walking or cycling to the workplace, Sunday-walking, etc.)

3. Intermediate: Participation in recreational sports or heavy gardening for at least 4 hours per week.

4. Intensive: Participation in hard training or sports competitions, regularly or several times per week.