1. Postural Control of the Lumbar Spine in Unstable Sitting
Richard A. Preuss, PT, MSc, Sylvain G. Grenier, PhD, Stuart M. McGill, PhD 
Archives of Physical Medicine and Rehabilitation 
Volume 86, Issue 12, Pages (December 2005)
DOI: /j.apmr
Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

2. Fig 1
Common balance patterns for (A) trial 1 and (B) trial 2 derived from PCA.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

3. Fig 2
Distributions of lumbar spine side-flexion angle during sitting balance for 2 subjects, representing unimodal and bimodal balance patterns.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

4. Fig 3
Binned histograms of balance data showing the distribution of quantitative sitting balance scores for the 2 trials.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

5. Fig 4
Average levels of electromyographic activity during the 2 balance trials, in the 14 trunk muscles tested. Abbreviations: EO, external oblique; IO, internal oblique; LE, lumbar erector; LT, latissimus dorsi; MF, lumbar multifidus; RA, rectus abdominis; TE, thoracic erector.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions