Mission Specialists Garrett Reisman and Steve Bowen were "camping out" in the Quest airlock overnight to purge nitrogen from their circulatory system, the US space agency said.

Their space walk -- the first of three -- was scheduled to begin Monday at 8:15 am (1215 GMT) and last 6.5 hours, according to NASA.

Reisman and Bowen will install a second station space-to-ground Ku-band antenna and a spare parts platform on Dextre, the two-armed robotic manipulator, officials said.

They will also loosen battery bolts on the port-6 backbone segment of the station in preparation for the other spacewalks.

Atlantis brought to the station six new 375-pound batteries to be installed during the second and third spacewalks.

The shuttle and its crew of six astronauts successfully docked with the orbiting space lab on Sunday about 220 miles (350 kilometers) above the South Pacific.

The mission is the 32nd and final scheduled voyage for Atlantis, which first launched in 1985 and has logged some 115 million miles in its career.

Only two more shuttle launches remain -- one in September for Discovery and the final blast off for Endeavour in November -- before the curtain falls on this era of human spaceflight.

The United States will then rely on Russia to take astronauts to the station aboard three-seater Soyuz spacecraft until a new fleet of commercial space taxis is operational.

During a mission of almost 13 days, most of which will be spent moored to the ISS, Atlantis and the crew will unload more than 12 tonnes of equipment, including power storage batteries, a communications antenna and a radiator.

The biggest single element is the five-ton Rassver research module, or MRM-1, which will provide additional storage space and a new docking port for Russian Soyuz and Progress spacecraft.

The Rassver -- "Dawn" in Russian -- will be permanently attached to the bottom of the space station's Zarya module and carries important hardware on its exterior including a radiator, airlock and a European robotic arm.

The spacewalks were scheduled to install the new batteries and communications antenna on the space station.

President Barack Obama effectively abandoned in February plans laid down by his predecessor George W. Bush to send astronauts back to the moon by 2020 and perhaps on to Mars with a new generation of rocket and spacecraft.

Constrained by soaring deficits, Obama submitted a budget to Congress that encouraged NASA to focus instead on developing commercial transport alternatives to ferry astronauts to the ISS after the shuttle program ends.

Nonetheless, Obama set a bold new course in April for the future of US space travel, laying out a vision to send American astronauts into Mars orbit within the next three decades.

He envisaged the design of a new spacecraft by 2025 for human travel deep into space and said he believed missions to asteroids and to orbit Mars by the mid-2030s were achievable.

By the time the final three missions are complete, the space shuttles -- characterized by NASA as the most advanced machines ever built -- will have flown 134 missions into orbit.

The ISS, a joint project involving 16 countries, has cost around 100 billion dollars, mostly funded by the United States.

NASA said Atlantis would be processed on return as normal just in case she was needed for a "rescue mission" in the event of an emergency with the two remaining shuttle flights.

But NASA has not entirely ruled out the possibility of Atlantis taking flight one last time on a comprehensive mission to the ISS next year -- provided Obama gives the go-ahead.

"If it happens to turn into a mission to the space station, we will do what is necessary," said NASA launch director Mike Leinbach.

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