A spacewalk is planned for the Atlantis mission in July, but it will performed by International Space Station crew, not by U.S. astronauts who arrive on the shuttle NASA said.
The Endeavour mission, STS-134, is the second to last for the American shuttle program. After Atlantis's planned launch in July, the three-decade program will end and the shuttles will become museum pieces.
A new pre-spacewalk exercise regimen, known informally as the slow motion hokey pokey and consisting of light exercises and breathing instead of an overnight camp-out in an airlock, was judged a resounding success.
NASA's flight surgeon "reported that there were no medical symptoms whatsoever" with the new approach to preventing decompression sickness, or "the bends" that scuba divers face when encountering changing pressure, said Derek Hassman, lead International Space Station flight director.
"He gave the crew a clean bill of health and the crew had nothing but positive feedback about the protocol - they really loved the simplicity of the protocol, the fact that it doesn't require as much time on the oxygen masks, it doesn't require the overnight camp-out."