Paris ? French President Nicolas Sarkozy collapsed while jogging Sunday on the lush grounds of the Chateau of Versailles and was to stay at a hospital overnight even though initial tests found nothing wrong, his office said.

Military doctors quickly performed a battery of tests on the 54-year-old president, who is known for his hyperactivity. The presidential Elysee Palace said Sarkozy’s test results were normal but that doctors would keep him under cardiological observation until today.

Upon his collapse, Sarkozy was rushed by helicopter to a military hospital. His office denied the president had lost consciousness in the episode. The Elysee Palace statement followed reports from members of Sarkozy’s government and his chief of staff, who had indicated that Sarkozy had lost consciousness.