SOLEUS H-REFLEX MODULATION AND PAIRED REFLEX DEPRESSION FROM PRONE TO STANDING AND FROM STANDING TO WALKING

HYE-SEON JEON Department of Physical Therapy, Yonsei University, Wonju, Kangwondo, Korea

CARL G. KUKULKA Department of Physical Medicine and Rehabilitation, Program in Physical Therapy University of Minnesota, Minneapolis, Minnesota, USA

DENIS BRUNT Department of Physical Therapy, School of Allied Health Sciences East Carolina University, Greenville, North Carolina, USA

ANDREA L. BEHRMAN Department of Physical Therapy University of Florida Gainesville, Florida, USA and The University of Florida Brain Institute, Gainesville, Florida, USA; The University of Florida Brain Institute Gainesville, Gainesville, Florida, USA

FLOYD J. THOMPSON The University of Florida Brain Institute Gainesville, Gainesville, Florida, USA; Department of Neuroscience, University of Florida, Gainesville, Florida, USA

Abstract

Patterns of soleus H-reflex modulation as a function of posture, task, and reflex activation history were assessed with three experimental paradigms: lying prone compared with standing unsupported; standing compared with the initiation of walking; and standing compared with the mid stance phase of walking. Paired H-reflexes, 80 ms apart, were evoked under each condition. The paired reflex depression (PRD), the percentage depression of the second H-reflex relative to the first H-reflex, was modulated independently of the first H-reflex across the postures and tasks. These results reveal divergent patterns of segmental reflex modulation and support the idea that segmental reflexes are controlled by multiple mechanisms.

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SOLEUS H-REFLEX MODULATION AND PAIRED REFLEX DEPRESSION FROM PRONE TO STANDING AND FROM STANDING TO WALKING

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SOLEUS H-REFLEX MODULATION AND PAIRED REFLEX DEPRESSION FROM PRONE TO STANDING AND FROM STANDING TO WALKING

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