Former British glam rocker Gary Glitter, serving jail time for molesting two girls, has been hospitalized for diarrhea and an irregular heartbeat in Vietnam, his doctor said Monday.

Glitter was taken to a prisoners' clinic in the southern province of Binh Thuan on Jan. 4 and recovered from intestinal problems about a week later, said Nguyen Thai Hoa, a doctor at the clinic.

The 63-year-old rocker remained hospitalized, however, after tests showed his heartbeat was slower than normal, Hoa said.

"He is fine now," he said. "Every morning he smiles and says good morning to me when I see him."

Hoa also said that Glitter is exercising daily.

Glitter, whose real name is Paul Francis Gadd, was convicted in March 2006 of committing "obscene acts with children." The incidents involved two Vietnamese girls, ages 10 and 11, from the southern coastal city of Vung Tau.

This three-year jail sentence was cut by three months last year for good behavior during an annual prisoner amnesty just before the Lunar New Year, known as Tet. He has been jailed since November 2005 and is being held at the Thu Duc prison in Binh Thuan. He is due to complete his term in August.

Glitter hit his musical peak in the 1970s. His crowd-pleasing anthem "Rock and Roll (Part 2)" is still played at many sporting events.