Spinal reciprocal inhibition in the co-contraction of the lower leg depends on muscle activity ratio
The spinal reciprocal inhibition during co-contraction remains unclear. Reports on the reciprocal Ia and D1 inhibitions in the co-contraction are lacking, and a point about the muscle activity amount during co-contraction is unclear. This study aimed to clarify the influence of changes in the ratio...
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| Veröffentlicht in: | Experimental brain research 2019-06, Vol.237 (6), p.1469-1478 |
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| creator | Hirabayashi, Ryo Edama, Mutsuaki Kojima, Sho Ito, Wataru Nakamura, Emi Kikumoto, Takanori Onishi, Hideaki |
| description | The spinal reciprocal inhibition during co-contraction remains unclear. Reports on the reciprocal Ia and D1 inhibitions in the co-contraction are lacking, and a point about the muscle activity amount during co-contraction is unclear. This study aimed to clarify the influence of changes in the ratio of soleus (Sol) and tibialis anterior (TA) muscle activities in co-contraction on reciprocal Ia and D1 inhibitions. Twenty healthy adults were subjected to four stimulatory conditions: a conditioning stimulus–test stimulation interval (CTI) of − 2, 2, or 20 ms or a test stimulus without a conditioning stimulus (single). Co-contraction [change in (Sol)/(TA) activity] was examined at task A, 0%/0% maximal voluntary contraction (MVC); task B, 5%/5% MVC; task C, 15%/15% MVC; task D, 5%/15% MVC; and task E, 15%/5% MVC. At 2-ms CTI, the H-reflex amplitude value was significantly lower in tasks A, B, C, and D than in the single condition. Among the tasks, the H-reflex amplitude values were lower for A, B, C, and D than for E. At 20-ms CTI, the H-reflex amplitude was significantly lower in tasks A, B, C, D, and E. Among the tasks, the H-reflex amplitude was significantly lower from task A and B to task E. The change in the muscle activity ratio during co-contraction could modulate reciprocal Ia inhibition depending on the Sol/TA muscle activity ratio. D1 inhibition at rest did not differ significantly when the Sol/TA ratio was equal or when TA muscle activity was high. During co-contraction with high Sol muscle activity, D1 inhibition decreased from rest. |
| doi_str_mv | 10.1007/s00221-019-05523-0 |
| format | Article |
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Reports on the reciprocal Ia and D1 inhibitions in the co-contraction are lacking, and a point about the muscle activity amount during co-contraction is unclear. This study aimed to clarify the influence of changes in the ratio of soleus (Sol) and tibialis anterior (TA) muscle activities in co-contraction on reciprocal Ia and D1 inhibitions. Twenty healthy adults were subjected to four stimulatory conditions: a conditioning stimulus–test stimulation interval (CTI) of − 2, 2, or 20 ms or a test stimulus without a conditioning stimulus (single). Co-contraction [change in (Sol)/(TA) activity] was examined at task A, 0%/0% maximal voluntary contraction (MVC); task B, 5%/5% MVC; task C, 15%/15% MVC; task D, 5%/15% MVC; and task E, 15%/5% MVC. At 2-ms CTI, the H-reflex amplitude value was significantly lower in tasks A, B, C, and D than in the single condition. Among the tasks, the H-reflex amplitude values were lower for A, B, C, and D than for E. At 20-ms CTI, the H-reflex amplitude was significantly lower in tasks A, B, C, D, and E. Among the tasks, the H-reflex amplitude was significantly lower from task A and B to task E. The change in the muscle activity ratio during co-contraction could modulate reciprocal Ia inhibition depending on the Sol/TA muscle activity ratio. D1 inhibition at rest did not differ significantly when the Sol/TA ratio was equal or when TA muscle activity was high. During co-contraction with high Sol muscle activity, D1 inhibition decreased from rest.</description><identifier>ISSN: 0014-4819</identifier><identifier>EISSN: 1432-1106</identifier><identifier>DOI: 10.1007/s00221-019-05523-0</identifier><identifier>PMID: 30899999</identifier><language>eng</language><publisher>Berlin/Heidelberg: Springer Berlin Heidelberg</publisher><subject>Adult ; Biomedical and Life Sciences ; Biomedicine ; Contraction ; Electric Stimulation ; Electromyography ; Extremities, Lower ; Female ; H-Reflex - physiology ; Health aspects ; Humans ; Inhibition (Neurophysiology) ; Leg ; Leg - physiology ; Male ; Muscle contraction ; Muscle Contraction - physiology ; Muscle function ; Muscle, Skeletal - physiology ; Muscles ; Neural Inhibition - physiology ; Neurological research ; Neurology ; Neurosciences ; Peroneal Nerve - physiology ; Physiological aspects ; Research Article ; Skeletal muscle ; Spinal cord ; Tibial Nerve - physiology ; Young Adult</subject><ispartof>Experimental brain research, 2019-06, Vol.237 (6), p.1469-1478</ispartof><rights>Springer-Verlag GmbH Germany, part of Springer Nature 2019</rights><rights>COPYRIGHT 2019 Springer</rights><rights>Experimental Brain Research is a copyright of Springer, (2019). All Rights Reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c573t-2f4127125e8b9e2e26c4cc027bb5e16562f38630f677155080549389d9942edc3</citedby><cites>FETCH-LOGICAL-c573t-2f4127125e8b9e2e26c4cc027bb5e16562f38630f677155080549389d9942edc3</cites><orcidid>0000-0002-9698-9276</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s00221-019-05523-0$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s00221-019-05523-0$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,41488,42557,51319</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/30899999$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Hirabayashi, Ryo</creatorcontrib><creatorcontrib>Edama, Mutsuaki</creatorcontrib><creatorcontrib>Kojima, Sho</creatorcontrib><creatorcontrib>Ito, Wataru</creatorcontrib><creatorcontrib>Nakamura, Emi</creatorcontrib><creatorcontrib>Kikumoto, Takanori</creatorcontrib><creatorcontrib>Onishi, Hideaki</creatorcontrib><title>Spinal reciprocal inhibition in the co-contraction of the lower leg depends on muscle activity ratio</title><title>Experimental brain research</title><addtitle>Exp Brain Res</addtitle><addtitle>Exp Brain Res</addtitle><description>The spinal reciprocal inhibition during co-contraction remains unclear. Reports on the reciprocal Ia and D1 inhibitions in the co-contraction are lacking, and a point about the muscle activity amount during co-contraction is unclear. This study aimed to clarify the influence of changes in the ratio of soleus (Sol) and tibialis anterior (TA) muscle activities in co-contraction on reciprocal Ia and D1 inhibitions. Twenty healthy adults were subjected to four stimulatory conditions: a conditioning stimulus–test stimulation interval (CTI) of − 2, 2, or 20 ms or a test stimulus without a conditioning stimulus (single). Co-contraction [change in (Sol)/(TA) activity] was examined at task A, 0%/0% maximal voluntary contraction (MVC); task B, 5%/5% MVC; task C, 15%/15% MVC; task D, 5%/15% MVC; and task E, 15%/5% MVC. At 2-ms CTI, the H-reflex amplitude value was significantly lower in tasks A, B, C, and D than in the single condition. Among the tasks, the H-reflex amplitude values were lower for A, B, C, and D than for E. At 20-ms CTI, the H-reflex amplitude was significantly lower in tasks A, B, C, D, and E. Among the tasks, the H-reflex amplitude was significantly lower from task A and B to task E. The change in the muscle activity ratio during co-contraction could modulate reciprocal Ia inhibition depending on the Sol/TA muscle activity ratio. D1 inhibition at rest did not differ significantly when the Sol/TA ratio was equal or when TA muscle activity was high. During co-contraction with high Sol muscle activity, D1 inhibition decreased from rest.</description><subject>Adult</subject><subject>Biomedical and Life Sciences</subject><subject>Biomedicine</subject><subject>Contraction</subject><subject>Electric Stimulation</subject><subject>Electromyography</subject><subject>Extremities, Lower</subject><subject>Female</subject><subject>H-Reflex - physiology</subject><subject>Health aspects</subject><subject>Humans</subject><subject>Inhibition (Neurophysiology)</subject><subject>Leg</subject><subject>Leg - physiology</subject><subject>Male</subject><subject>Muscle contraction</subject><subject>Muscle Contraction - physiology</subject><subject>Muscle function</subject><subject>Muscle, Skeletal - physiology</subject><subject>Muscles</subject><subject>Neural Inhibition - physiology</subject><subject>Neurological research</subject><subject>Neurology</subject><subject>Neurosciences</subject><subject>Peroneal Nerve - physiology</subject><subject>Physiological aspects</subject><subject>Research Article</subject><subject>Skeletal muscle</subject><subject>Spinal cord</subject><subject>Tibial Nerve - 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Academic</collection><jtitle>Experimental brain research</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hirabayashi, Ryo</au><au>Edama, Mutsuaki</au><au>Kojima, Sho</au><au>Ito, Wataru</au><au>Nakamura, Emi</au><au>Kikumoto, Takanori</au><au>Onishi, Hideaki</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Spinal reciprocal inhibition in the co-contraction of the lower leg depends on muscle activity ratio</atitle><jtitle>Experimental brain research</jtitle><stitle>Exp Brain Res</stitle><addtitle>Exp Brain Res</addtitle><date>2019-06-01</date><risdate>2019</risdate><volume>237</volume><issue>6</issue><spage>1469</spage><epage>1478</epage><pages>1469-1478</pages><issn>0014-4819</issn><eissn>1432-1106</eissn><abstract>The spinal reciprocal inhibition during co-contraction remains unclear. Reports on the reciprocal Ia and D1 inhibitions in the co-contraction are lacking, and a point about the muscle activity amount during co-contraction is unclear. This study aimed to clarify the influence of changes in the ratio of soleus (Sol) and tibialis anterior (TA) muscle activities in co-contraction on reciprocal Ia and D1 inhibitions. Twenty healthy adults were subjected to four stimulatory conditions: a conditioning stimulus–test stimulation interval (CTI) of − 2, 2, or 20 ms or a test stimulus without a conditioning stimulus (single). Co-contraction [change in (Sol)/(TA) activity] was examined at task A, 0%/0% maximal voluntary contraction (MVC); task B, 5%/5% MVC; task C, 15%/15% MVC; task D, 5%/15% MVC; and task E, 15%/5% MVC. At 2-ms CTI, the H-reflex amplitude value was significantly lower in tasks A, B, C, and D than in the single condition. Among the tasks, the H-reflex amplitude values were lower for A, B, C, and D than for E. At 20-ms CTI, the H-reflex amplitude was significantly lower in tasks A, B, C, D, and E. Among the tasks, the H-reflex amplitude was significantly lower from task A and B to task E. The change in the muscle activity ratio during co-contraction could modulate reciprocal Ia inhibition depending on the Sol/TA muscle activity ratio. D1 inhibition at rest did not differ significantly when the Sol/TA ratio was equal or when TA muscle activity was high. During co-contraction with high Sol muscle activity, D1 inhibition decreased from rest.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><pmid>30899999</pmid><doi>10.1007/s00221-019-05523-0</doi><tpages>10</tpages><orcidid>https://orcid.org/0000-0002-9698-9276</orcidid></addata></record> |
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| subjects | Adult Biomedical and Life Sciences Biomedicine Contraction Electric Stimulation Electromyography Extremities, Lower Female H-Reflex - physiology Health aspects Humans Inhibition (Neurophysiology) Leg Leg - physiology Male Muscle contraction Muscle Contraction - physiology Muscle function Muscle, Skeletal - physiology Muscles Neural Inhibition - physiology Neurological research Neurology Neurosciences Peroneal Nerve - physiology Physiological aspects Research Article Skeletal muscle Spinal cord Tibial Nerve - physiology Young Adult |
| title | Spinal reciprocal inhibition in the co-contraction of the lower leg depends on muscle activity ratio |
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