Interlimb Differences in Postural Responses During Symmetric and Asymmetric Stance: PDF OnlyInterlimb Differences in Postural Responses During Symmetric and Asymmetric StanceStauffer, Suzanne Herman MS, PT; Bradley, Nina S. PhD, PTAuthor Information Department of Physical Therapy and Biokinesiology, University of Southern California. SH Stauffer was a graduate student in the Department of Physical Therapy and Biokinesiology, University of Southern California, and conducted this study as partial fulfillment of the MS degree. NS Bradley is an associate professor in the Department of Physical Therapy and Biokinesiology, University of Southern California. Neurology Report: Volume 23 - Issue 2 - p 44-51 Free Abstract It is assumed that postural responses of neurologically intact adults are similar bilaterally, whereas differences between legs of individuals with hemiplegia are pathologic. Our purpose was to determine that there are no differences in postural responses between legs during symmetric stance and that there are no differences in responses between symmetric and asymmetric stance. A computerized posturography system induced perturbations to 10 volunteers (52-80 years of age) free of neuropathology during symmetric and asymmetric stance. Muscle patterns for both legs and center of pressure (COP) data were analyzed and compared. Subjects exhibited larger COP excursions during asymmetric versus symmetric stance. Onset latencies of muscle activity differed between legs, regardless of stance condition. The muscle activation sequence differed between legs, especially during asymmetric stance. This suggests that postural responses are uniquely adapted for each leg and stance posture. Interlimb differences in individuals with hemiplegia may not be solely attributable to neuropathology. © 1999 Lippincott Williams & Wilkins, Inc.