Table 1. Selected Controlled Studies of the Prevalence of AF in Athletes.

Study Type	Number of subjects	Age/Gender	Type of exercise	Prevalence of AF in athletes/controls (%)
Karjalainen et al[15]	795	35-39 years/ Male	Cross country Running	5.3/0.9
Baldesberger et al[17]	196	~66 years/ Male	Cyclists vs. golfers	10/0
Mont et al[8]	216	<65 years/ Male + Female	Endurance athletes	63/15
Elosua et al[16]	109	41-55 years/ Male	Endurance athletes	32/14
Heidbuchel et al[22]		60 years/83% Male, 17% Female	Cycling, running, or swimming
Molina et al[18]	557	48 years	Marathon runners vs. sedentary	5/0.7
Grimsmo et al[11]	78	54-62 years- Group I 72-80 years- Group II 87-92 years- Group III	Cross-country runners, skiers	12.8