Relationship Between Hip Abductor Rate of Force Development and Mediolateral Stability in Older Adults  Shuo-Hsiu J. Chang, PT, MS, Vicki S. Mercer, PT, PhD, Carol A. Giuliani, PT, PhD, Philip D. Sloane, MD, MPH  Archives of Physical Medicine and Rehabilitation  Volume 86, Issue 9, Pages 1843-1850 (September 2005) DOI: 10.1016/j.apmr.2005.03.006 Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 1 Hip abductor force curve for a single trial for 1 subject illustrating calculation of 10% to 60% and 10% to 90% RFD variables. Archives of Physical Medicine and Rehabilitation 2005 86, 1843-1850DOI: (10.1016/j.apmr.2005.03.006) Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 2 Vertical ground reaction force (top) and ML COP displacement during a single trial of compensatory stepping with APA. The subject stepped first with the left foot. Note the increase in the vertical ground reaction force under the left foot prior to initiation of the step, indicating the presence of an APA. Filled line indicates the ground reaction force under the left foot and dotted line indicates the ground reaction force under the right foot. The COP was displaced toward the left side of the subject during the APA then toward the right when the subject lifted the left foot off the ground. Abbreviations: L, left; R, right. Archives of Physical Medicine and Rehabilitation 2005 86, 1843-1850DOI: (10.1016/j.apmr.2005.03.006) Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions