1. Effect of Respiration on the Static Rear Stability of Wheelchairs
R. Lee Kirby, MD, FRCPC, Olivier Heimrath, BSc, Angela Stewart, BSc, Cher Smith, MSc, Donald A. MacLeod, MSc 
Archives of Physical Medicine and Rehabilitation 
Volume 91, Issue 6, Pages (June 2010)
DOI: /j.apmr
Copyright © 2010 American Congress of Rehabilitation Medicine Terms and Conditions

2. Fig 1
No-hands wheelie rest. The force line from the center of gravity falls within the base of support (between the contact point of the locked rear wheels with the ground and the contact point of the push handles with the wall).
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2010 American Congress of Rehabilitation Medicine Terms and Conditions

3. Fig 2
Wheelchair stability testing platform set up for static rear-stability testing with the brakes unlocked, just before (A) and after (B) the stability endpoint (caster lift-off) is reached.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2010 American Congress of Rehabilitation Medicine Terms and Conditions