It is interesting is that an early study on the health impact of activity compared bus drivers and bus conductors, who also differ in sitting/standing: http://

It is interesting is that an early study on the health impact of activity compared bus drivers and bus conductors, who also differ in sitting/standing: http://circ.ahajournals.org/content/122/7/743.full#ref-1 http://circ.ahajournals.org/content/122/7/743.full#ref-1 Edit: sorry someone else had a better link: http://www.epi.umn.edu/cvdepi/study.asp?id=13 http://www.epi.umn.edu/cvdepi/study.asp?id=13