Limb compressive load does not inhibit post activation depression of soleus H-reflex in indiviudals with chronic spinal cord injury
Identifieur interne : 001689 ( Pmc/Curation ); précédent : 001688; suivant : 001690Limb compressive load does not inhibit post activation depression of soleus H-reflex in indiviudals with chronic spinal cord injury
Auteurs : Shih-Chiao Tseng [États-Unis] ; Richard K. Shields [États-Unis]Source :
- Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology [ 1388-2457 ] ; 2012.
Abstract
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.
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DOI: 10.1016/j.clinph.2012.10.020
PubMed: 23168355
PubMed Central: 3633603
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<front><journal-meta><journal-id journal-id-type="nlm-journal-id">100883319</journal-id><journal-id journal-id-type="pubmed-jr-id">21365</journal-id><journal-id journal-id-type="nlm-ta">Clin Neurophysiol</journal-id><journal-id journal-id-type="iso-abbrev">Clin Neurophysiol</journal-id><journal-title-group><journal-title>Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology</journal-title></journal-title-group><issn pub-type="ppub">1388-2457</issn><issn pub-type="epub">1872-8952</issn></journal-meta><article-meta><article-id pub-id-type="pmid">23168355</article-id><article-id pub-id-type="pmc">3633603</article-id><article-id pub-id-type="doi">10.1016/j.clinph.2012.10.020</article-id><article-id pub-id-type="manuscript">NIHMS462475</article-id><article-categories><subj-group subj-group-type="heading"><subject>Article</subject></subj-group></article-categories><title-group><article-title>Limb compressive load does not inhibit post activation depression of soleus H-reflex in indiviudals with chronic spinal cord injury</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Tseng</surname><given-names>Shih-Chiao</given-names></name><xref ref-type="aff" rid="A1">a</xref></contrib><contrib contrib-type="author"><name><surname>Shields</surname><given-names>Richard K.</given-names></name><xref ref-type="aff" rid="A2">b</xref><xref ref-type="corresp" rid="CR1">*</xref></contrib></contrib-group><aff id="A1"><label>a</label>School of Physical Therapy, Texas Woman's University, United States</aff><aff id="A2"><label>b</label>Department of Physical Therapy & Rehabilitation Science, University of Iowa, Carver College of Medicine, Iowa City, IA, USA</aff><author-notes><corresp id="CR1"><label>*</label>Corresponding author. Address: Physical Therapy & Rehabilitation Science, Carver College of Medicine, University of Iowa, 1-252 Medical Education Building Iowa City, IA 52242, USA. Tel.: +1 319 335 9803; fax: +1 319 335 9707. <email>richard-shields@uiowa.edu</email> (R.K. Shields).</corresp></author-notes><pub-date pub-type="nihms-submitted"><day>16</day><month>4</month><year>2013</year></pub-date><pub-date pub-type="epub"><day>17</day><month>11</month><year>2012</year></pub-date><pub-date pub-type="ppub"><month>5</month><year>2013</year></pub-date><pub-date pub-type="pmc-release"><day>01</day><month>5</month><year>2013</year></pub-date><volume>124</volume><issue>5</issue><fpage>982</fpage><lpage>990</lpage><permissions><copyright-statement>© 2012 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved</copyright-statement><copyright-year>2012</copyright-year></permissions><abstract><sec id="S1"><title>Objective</title><p id="P1">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.</p></sec><sec id="S2"><title>Methods</title><p id="P2">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.</p></sec><sec id="S3"><title>Results</title><p id="P3">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.</p></sec><sec id="S4"><title>Conclusions</title><p id="P4">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.</p></sec><sec id="S5"><title>Significance</title><p id="P5">Early limb load training may impact the reorganization of the spinal cord in humans with acute SCI.</p></sec></abstract><kwd-group><kwd>Compression</kwd><kwd>Homosynaptic depression</kwd><kwd>Spinal neural modulation</kwd></kwd-group><funding-group><award-group><funding-source country="United States">National Institute of Nursing Research : NINR</funding-source><award-id>R01 NR010285 || NR</award-id></award-group><award-group><funding-source country="United States">National Institute of Child Health & Human Development : NICHD</funding-source><award-id>R01 HD062507 || HD</award-id></award-group></funding-group></article-meta></front></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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