Journal article
Limb compressive load does not inhibit post activation depression of soleus H-reflex in indiviudals with chronic spinal cord injury
Clinical neurophysiology, Vol.124(5), pp.982-990
05/2013
DOI: 10.1016/j.clinph.2012.10.020
PMCID: PMC3633603
PMID: 23168355
Abstract
► Segment compressive load minimally modulates the soleus H-reflex response in individuals with chronic SCI. ► Diminished spinal reflex modulation to compressive load is associated with a loss of post activation depression in a reorganized spinal cord. ► Findings raise a question as to whether compressive load can influence spinal neuronal reorganization from the acute to the chronic state after SCI.
We investigated the effect of various doses of limb compressive load on soleus H-reflex amplitude and post activation depression in individuals with/without chronic SCI. We hypothesized that SCI reorganization changes the typical reflex response to an external load.
Ten healthy adults and 10 individuals with SCI received three doses of compressive load to the top of their knee (10%, 25%, and 50% of the body weight, BW). Soleus H-reflexes were measured before (baseline) and during the loading phase.
With persistent background muscle activity across all testing sessions, segment compressive load significantly decreased post activation depression in the control group, but did not change the post activation ratio in the SCI group. Normalized H2 amplitude significantly increased according to load (50%>25%>10%) in the control group whereas was minimally modulated to load in those with SCI.
Segment compressive load inhibits post activation depression in humans without SCI, but minimally modulates the reflex circuitry in people with chronic SCI. These findings suggest that spinal cord reorganization mitigates the typical response to load in people with chronic SCI.
Early limb load training may impact the reorganization of the spinal cord in humans with acute SCI.
Details
- Title: Subtitle
- Limb compressive load does not inhibit post activation depression of soleus H-reflex in indiviudals with chronic spinal cord injury
- Creators
- Shih-Chiao Tseng - School of Physical Therapy, Texas Woman’s University, United StatesRichard K Shields - Department of Physical Therapy & Rehabilitation Science, University of Iowa, Carver College of Medicine, Iowa City, IA, USA
- Resource Type
- Journal article
- Publication Details
- Clinical neurophysiology, Vol.124(5), pp.982-990
- DOI
- 10.1016/j.clinph.2012.10.020
- PMID
- 23168355
- PMCID
- PMC3633603
- NLM abbreviation
- Clin Neurophysiol
- ISSN
- 1388-2457
- eISSN
- 1872-8952
- Publisher
- Elsevier Ireland Ltd
- Language
- English
- Date published
- 05/2013
- Academic Unit
- Orthopedics and Rehabilitation; Physical Therapy and Rehabilitation Science
- Record Identifier
- 9984047776902771
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