Repeatability of corticospinal and spinal measures during lengthening and shortening contractions in the human tibialis anterior muscle.

<h4>Unlabelled</h4>Elements of the human central nervous system (CNS) constantly oscillate. In addition, there are also methodological factors and changes in muscle mechanics during dynamic muscle contractions that threaten the stability and consistency of transcranial magnetic stimulati...

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Autores principales:	Jamie Tallent, Stuart Goodall, Tibor Hortobágyi, Alan St Clair Gibson, Duncan N French, Glyn Howatson
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5b37f79dade240bebfafc67c8ec74ae1
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spelling	oai:doaj.org-article:5b37f79dade240bebfafc67c8ec74ae12021-11-18T07:20:43ZRepeatability of corticospinal and spinal measures during lengthening and shortening contractions in the human tibialis anterior muscle.1932-620310.1371/journal.pone.0035930https://doaj.org/article/5b37f79dade240bebfafc67c8ec74ae12012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22563418/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Unlabelled</h4>Elements of the human central nervous system (CNS) constantly oscillate. In addition, there are also methodological factors and changes in muscle mechanics during dynamic muscle contractions that threaten the stability and consistency of transcranial magnetic stimulation (TMS) and perpherial nerve stimulation (PNS) measures.<h4>Purpose</h4>To determine the repeatability of TMS and PNS measures during lengthening and shortening muscle actions in the intact human tibialis anterior.<h4>Methods</h4>On three consecutive days, 20 males performed lengthening and shortening muscle actions at 15, 25, 50 and 80% of maximal voluntary contraction (MVC). The amplitude of the Motor Evoked Potentials (MEPs) produced by TMS was measured at rest and during muscle contraction at 90° of ankle joint position. MEPs were normalised to Mmax determined with PNS. The corticospinal silent period was recorded at 80% MVC. Hoffman reflex (H-reflex) at 10% isometric and 25% shortening and lengthening MVCs, and V-waves during MVCs were also evoked on each of the three days.<h4>Results</h4>With the exception of MEPs evoked at 80% shortening MVC, all TMS-derived measures showed good reliability (ICC = 0.81-0.94) from days 2 to 3. Confidence intervals (CI, 95%) were lower between days 2 and 3 when compared to days 1 and 2. MEPs significantly increased at rest from days 1 to 2 (P = 0.016) and days 1 to 3 (P = 0.046). The H-reflex during dynamic muscle contraction was reliable across the three days (ICC = 0.76-0.84). V-waves (shortening, ICC = 0.77, lengthening ICC = 0.54) and the H-reflex at 10% isometric MVC (ICC = 0.66) was generally less reliable over the three days.<h4>Conclusion</h4>Although it is well known that measures of the intact human CNS exhibit moment-to-moment fluctuations, careful experimental arrangements make it possible to obtain consistent and repeatable measurements of corticospinal and spinal excitability in the actively lengthening and shortening human TA muscle.Jamie TallentStuart GoodallTibor HortobágyiAlan St Clair GibsonDuncan N FrenchGlyn HowatsonPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 4, p e35930 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jamie Tallent Stuart Goodall Tibor Hortobágyi Alan St Clair Gibson Duncan N French Glyn Howatson Repeatability of corticospinal and spinal measures during lengthening and shortening contractions in the human tibialis anterior muscle.
description	<h4>Unlabelled</h4>Elements of the human central nervous system (CNS) constantly oscillate. In addition, there are also methodological factors and changes in muscle mechanics during dynamic muscle contractions that threaten the stability and consistency of transcranial magnetic stimulation (TMS) and perpherial nerve stimulation (PNS) measures.<h4>Purpose</h4>To determine the repeatability of TMS and PNS measures during lengthening and shortening muscle actions in the intact human tibialis anterior.<h4>Methods</h4>On three consecutive days, 20 males performed lengthening and shortening muscle actions at 15, 25, 50 and 80% of maximal voluntary contraction (MVC). The amplitude of the Motor Evoked Potentials (MEPs) produced by TMS was measured at rest and during muscle contraction at 90° of ankle joint position. MEPs were normalised to Mmax determined with PNS. The corticospinal silent period was recorded at 80% MVC. Hoffman reflex (H-reflex) at 10% isometric and 25% shortening and lengthening MVCs, and V-waves during MVCs were also evoked on each of the three days.<h4>Results</h4>With the exception of MEPs evoked at 80% shortening MVC, all TMS-derived measures showed good reliability (ICC = 0.81-0.94) from days 2 to 3. Confidence intervals (CI, 95%) were lower between days 2 and 3 when compared to days 1 and 2. MEPs significantly increased at rest from days 1 to 2 (P = 0.016) and days 1 to 3 (P = 0.046). The H-reflex during dynamic muscle contraction was reliable across the three days (ICC = 0.76-0.84). V-waves (shortening, ICC = 0.77, lengthening ICC = 0.54) and the H-reflex at 10% isometric MVC (ICC = 0.66) was generally less reliable over the three days.<h4>Conclusion</h4>Although it is well known that measures of the intact human CNS exhibit moment-to-moment fluctuations, careful experimental arrangements make it possible to obtain consistent and repeatable measurements of corticospinal and spinal excitability in the actively lengthening and shortening human TA muscle.
format	article
author	Jamie Tallent Stuart Goodall Tibor Hortobágyi Alan St Clair Gibson Duncan N French Glyn Howatson
author_facet	Jamie Tallent Stuart Goodall Tibor Hortobágyi Alan St Clair Gibson Duncan N French Glyn Howatson
author_sort	Jamie Tallent
title	Repeatability of corticospinal and spinal measures during lengthening and shortening contractions in the human tibialis anterior muscle.
title_short	Repeatability of corticospinal and spinal measures during lengthening and shortening contractions in the human tibialis anterior muscle.
title_full	Repeatability of corticospinal and spinal measures during lengthening and shortening contractions in the human tibialis anterior muscle.
title_fullStr	Repeatability of corticospinal and spinal measures during lengthening and shortening contractions in the human tibialis anterior muscle.
title_full_unstemmed	Repeatability of corticospinal and spinal measures during lengthening and shortening contractions in the human tibialis anterior muscle.
title_sort	repeatability of corticospinal and spinal measures during lengthening and shortening contractions in the human tibialis anterior muscle.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/5b37f79dade240bebfafc67c8ec74ae1
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Repeatability of corticospinal and spinal measures during lengthening and shortening contractions in the human tibialis anterior muscle.

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