While doctors insisted Mr Sarkozy had received a clean bill of health, a spokesman for the President's party said the collapse represented a "cardiac alert". An official statement said the collapse had been caused by a bout of dizziness sparked by a 45-minute run in hot weather "in a context of tiredness linked to a heavy workload".
French President Nicolas Sarkozy has been taken to hospital for medical tests after complaining he felt unwell while exercising.
Mr Sarkozy "felt faint" while doing sports and his personal doctor immediately took charge of him, according to a statement from the Elysee Palace.
France 2 television said Mr Sarkozy, 54, was hospitalised after his morning jogging session.
Mr Sarkozy, who was elected in 2007, is regularly seen running and is a cycling enthusiast.
He last underwent a medical examination July 3, when his cardiovascular and blood tests were normal.
His first medical bulletin, issued shortly after his 2007 election, said Mr Sarkozy's health was "good" and compatible with his presidential duties.
