Editing Extravehicular activity (section)

==Camp-out procedure==
For EVAs from the [[International Space Station]], NASA employed a [[Quest Joint Airlock#Camp-out procedure|''camp-out'' procedure]] to reduce the risk of decompression sickness.<ref name="tanner">{{Cite web|url=http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts115/interview_tanner.html|title=Preflight Interview: Joe Tanner|access-date=February 8, 2008|publisher=NASA|year=2006|author=NASA|archive-date=May 12, 2013|archive-url=https://web.archive.org/web/20130512135522/http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts115/interview_tanner.html|url-status=dead}}</ref> This was first tested by the Expedition 12 crew. During a camp-out, astronauts sleep overnight in the [[Quest Joint Airlock|airlock]] prior to an EVA, lowering the air pressure to {{convert|10.2|psi|abbr=on}}, compared to the normal station pressure of {{convert|14.7|psi|abbr=on}}.<ref name="tanner"/> Spending a night at the lower air pressure helps flush nitrogen from the body, thereby preventing "[[Decompression sickness|the bends]]".<ref>{{cite web | title = International Space Station Status Report #06-7 | url = http://spaceflight.nasa.gov/spacenews/reports/issreports/2006/iss06-7.html | archive-url = https://web.archive.org/web/20060615191754/http://spaceflight.nasa.gov/spacenews/reports/issreports/2006/iss06-7.html | url-status = dead | archive-date = 2006-06-15 | publisher = NASA|author=NASA|access-date=2006-02-17}}</ref><ref>{{cite web | url = http://www.nasa.gov/mission_pages/station/expeditions/campout.html | title = Pass the S'mores Please! Station Crew 'Camps Out' | publisher = NASA | author = NASA | access-date = 2006-04-01 | archive-date = May 12, 2013 | archive-url = https://web.archive.org/web/20130512155656/http://www.nasa.gov/mission_pages/station/expeditions/campout.html | url-status = dead }}</ref> More recently astronauts have been using the In-Suit Light Exercise protocol rather than camp-out to prevent decompression sickness.<ref>{{cite web | url = https://www.nasa.gov/feature/eva-physiology | title = EVA Physiology | publisher = NASA | author = NASA | date = February 26, 2015 | access-date = 2018-04-27 }}</ref><ref>{{cite web | url = https://ntrs.nasa.gov/search.jsp?R=20110007150 | title = In-Suit Light Exercise (ISLE) Prebreathe Protocol Peer Review Assessment. Volume 1 | publisher = NASA | author1 = Brady, Timothy K. |author2=Polk, James D. | date = February 2011 | access-date = 2018-04-27 }}</ref>