Kissimmee, FL (My Sportsbook) - Houston Astros pitcher Mike Hampton was cleared to resume baseball activities after tests revealed his heartbeat had returned to normal.

Hampton was diagnosed with a minor irregularity in his heartbeat during an EKG test as part of a routine physical on Saturday. Doctors said it is possible for the irregular rhythm to reoccur, but don't expect that happen.

He will not require medication for his condition after an EKG test Monday came back negative.

"It is not unusual for individuals to experience episodes of irregular rhythms and then have the rhythm return to normal without treatment," Astros team physician Dr. Jim Muntz said.

Hampton returned to Houston as a free agent this offseason, signing a one-year deal worth $2 million plus incentives.

The 36-year-old left-hander enjoyed some of the best years of his career in his first go-round with the Astros. A career-high, 22-win season in 1999 saw him finish second to Randy Johnson in the Cy Young Award voting. A successful six-year stint with the club ended after that season with Hampton joining the New York Mets for one year.

Hampton went on to pitch for Colorado for two years, then signed with Atlanta, where his career has been racked with injuries. Hampton made 60 starts for the Braves over his first two seasons (2003-04), but has since made just 25 over the past four years.

His entire 2006 campaign was wiped out after undergoing Tommy John surgery and he missed the 2007 season due to a strained oblique and torn flexor tendon.

In 388 career games, including 334 starts, for the Mariners, Astros, Mets, Rockies and Braves, the veteran has a record of 141-105 with a 4.01 earned run average.