Reliability of a simple method for determining muscle fiber conduction velocity

McIntosh, Kyle; Gabriel, David A.

doi:10.1002/mus.22268

Cited by 23 publications

(37 citation statements)

References 40 publications

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“…The significant force increase exhibited during the retention block was 11.4% greater than the average of the familiarization blocks. The magnitude of strength gain is consistent with previous literature on "quick jumps in strength" as a result of strength assessment alone and not a progressive resistive exercise regimen (Calder and Gabriel 2007;McIntosh and Gabriel 2012). It is generally accepted that strength gains because of a limited number of contractions are associated with a motor learning or "familiarization" effect (Knight and Kamen 2001;Selvanayagam et al 2011).…”

Section: Between Sessionsupporting

confidence: 72%

“…Adjustable belts were strapped across the waist and chest to avoid extraneous movement. The participant's right foot was secured on a footplate positioned at 20°of plantar flexion (Feiereisen et al 1997;Marsh et al 1981;McIntosh and Gabriel 2012;McNeil et al 2005). A load cell (JR3 Inc., Woodland, Calif., USA) attached to the bottom of the foot plate recorded force.…”

Section: Methodsmentioning

confidence: 99%

“…The procedures detailed above for sEMG collection have been used in our lab and shown to be highly reliable (McIntosh and Gabriel 2012). Electrode placement was marked with indelible ink and participants were required to maintain the marks from 1 session to the next.…”

Section: Surface Electromyographic Recordingsmentioning

confidence: 99%

“…This was not seen during any trials suggesting that participants were truly contracting maximally. The goal of the familiarization session was for participants to learn how to perform maximal effort contractions of the dorsiflexors while minimizing extraneous movements that may recruit other muscles (Calder and Gabriel 2007;McIntosh and Gabriel 2012). Participants were instructed to contract "hard and fast" and maintain a steady force level at maximum effort for the 5 s. A retention test was performed 72 h following the familiarization test day.…”

Section: Protocolmentioning

confidence: 99%

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Quantifying the familiarization period for maximal resistive exercise

Green

Parro

Gabriel

2014

Appl. Physiol. Nutr. Metab.

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Resistive exercise is used in the assessment of musculoskeletal health, performance, training interventions, and population differences (i.e., gender, age, training status). There is a need to determine the amount of familiarization required to stabilize performance prior to testing. Fifteen males completed a familiarization session consisting of 3 blocks of 5 maximal isometric dorsiflexion contractions, followed by a retention test (an additional block of 5 contractions) performed 3 days later. Mean force and surface electromyography (sEMG) from both the agonist and antagonist muscles were collected. A variance ratio, representing the stability between trials, was calculated for each of the 4 blocks of 5 contractions for both force and sEMG. The variance ratio for both force and agonist sEMG decreased significantly within the first 10 trials and remained stable during the retention test. The variance ratio for antagonist sEMG was stable across the 3 blocks of familiarization and significantly decreased during the retention test. The magnitude variables all remained stable across the 3 familiarization blocks. However, an 11% increase in mean force was seen during the retention test while both agonist and antagonist sEMG remained stable. Although slight changes occurred in the magnitude variables during the retention test, the stabilization of the force and agonist sEMG variance ratios suggest that familiarization to the task was achieved within the first 10 contractions and was sustained over a 3-day period.

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Section: Between Sessionsupporting

confidence: 72%

Section: Methodsmentioning

confidence: 99%

Section: Surface Electromyographic Recordingsmentioning

confidence: 99%

Section: Protocolmentioning

confidence: 99%

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Quantifying the familiarization period for maximal resistive exercise

Green

Parro

Gabriel

2014

Appl. Physiol. Nutr. Metab.

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“…A aceitação da estimativa foi baseada no coeficiente de correlação (r) entre as janelas selecionadas (r > 0,7). Foram descartados valores da VCFM que não estavam dentro da faixa de valores fisiológicos (2-8 m/s) [28]. Por fim, foi calculada a média de todos os valores da VCFM obtidos no período de tempo de 25 s.…”

Section: Materiais E Métodosunclassified

Avaliação Da Velocidade De Condução Da Fibra Muscular Em Indivíduos Diabéticos Com E Sem Neuropatia Periférica

Favretto¹,

Cossul²,

Andreis³

et al. 2018

Anais Do v Congresso Brasileiro De Eletromiografia E Cinesiologia E X Simpósio De Engenharia Biomédica

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Resumo: A Neuropatia Diabética Periférica (NDP) está relacionada às alterações no sistema neuromuscular através do aparecimento de sintomas como fraqueza e atrofia muscular. Este trabalho analisou a Velocidade de Condução da Fibra Muscular (VCFM) de 22 indivíduos adultos durante a contração isométrica voluntária máxima no músculo tibial anterior, utilizando um eletromiógrafo de alta densidade (HD-sEMG) de 32 canais. Os indivíduos foram divididos em três grupos: indivíduos saudáveis (n = 7), indivíduos com diabetes tipo 2 sem NDP (n = 8) e com NDP (n = 7). Os dois grupos de indivíduos com diabetes apresentaram VCFM menor que o grupo controle, sendo que a diminuição da VCFM para diabéticos com NDP (5,75±0,22 vs. 3,71±0,21, p<0,000001) é mais acentuada que para diabéticos sem NDP (4,76±0,41, p<0,0001). Conclui-se que estas alterações são devido a perda da unidade motora e consequentemente atrofia da fibra muscular ocasionadas pela Diabetes Mellitus e a NDP. Palavras-chave: Neuropatia diabética periférica, velocidade de condução da fibra muscular, sistema neuromuscular, eletromiografia de alta densidade. Abstract: Diabetic Peripheral Neuropathy (DPN) is related to changes in the neuromuscular system with symptoms such as muscular atrophy and weakness. This work analyzed the Muscle Fiber Conduction Velocity (MFCV) of 22 adults during maximal isometric voluntary contraction of tibialis anterior muscle, using a 32 channel High-Density Surface Electromyography (HD-sEMG). The subjects were divided into three groups: healthy (n = 7), diabetic without DPN (n = 8) and diabetic with DPN (n = 7). Both diabetic groupsshowed reduced MFCV when compared to control, which is even lower for diabetic with DPN (5.75±0.22 vs. 3.71±0.21, p<0.000001) than for diabetic without DPN (4.76±0.41, p<0.0001 [6]. Mais tarde aparecem os primeiros sinais clínicos de disfunções motoras que consistem na perda da força nos músculos distais localizados nos membros inferiores [7,8], afetando principalmente músculos com maior proporção de fibras do tipo I como o Tibial Anterior (TA) [9,10]. Estudos têm relatado que disfunções musculares no TA podem levar a alterações na distribuição da pressão plantar, e consequentemente, gerar uma deformidade óssea (calos) que, com a marcha contínua pode evoluir para ulceração [11,12]. Acredita-se que a maioria das úlceras dos pés diabéticos se desenvolvem como resultado da ação repetitiva do estresse mecânico (pressão) gerado durante a marcha [13]. As amputações em membros inferiores dos indivíduos diabéticos são geralmente devido a úlceras plantares [5].Embora os sintomas motores não são relatados no início da NDP, existem evidências que as alterações no sistema motor ocorrem ao mesmo tempo que as disfunções sensoriais [14]. Porém, devido a um mecanismo compensatório caracterizado pelo processo de denervação e reinervação, caracterizado pela perda contínua da Unidade Motora (UM) unida a reinervação das fibras órfãs, o neurônio motor permanece mais preservado, escondendo o envolvimento do sistema neuromuscular no c...

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