Rumors that Federal Reserve Chairman Alan Greenspan had a heart attack were denied by his spokesman, but the false reports still affected trading in Europe Friday.

The rumors apparently surfaced among Asian traders and then spread to European bond markets, helping to push up the prices of German bond futures in early trading, dealers said. Some dealers said the rise also may have been due to an increase in the value of the dollar against the German mark late Thursday.In later trading, the markets recovered.

Fed Reserve spokesman Joseph Coyne said there was "no truth" to the report that Greenspan had a heart attack.

Friday was Greenspan's 72nd birthday.