1. The influence of Tai Chi training on the center of pressure trajectory during gait initiation in older adults1 
Chris J. Hass, PhD, Robert J. Gregor, PhD, Dwight E. Waddell, PhD, Alanna Oliver, MA, Dagan W. Smith, MS, Richard P. Fleming, BS, Steven L. Wolf, PhD 
Archives of Physical Medicine and Rehabilitation 
Volume 85, Issue 10, Pages (October 2004)
DOI: /j.apmr

2. Fig 1
Overhead view of the path of the COP during forward gait initiation when stepping with the left foot. Landmark 1 and landmark 2 were identified, leading to the separation of the COP trace into the defined sections S1, S2, and S3.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )

3. Fig 2
Significant treatment group by time interaction for the displacement of the COP in the AP direction (x).
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )

4. Fig 3
Graphical representation of the significant treatment group by time interaction for the velocity of the COP movement in the AP direction (V[x]) during the S2 time period.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )