Muscle force production and functional performance in spastic cerebral palsy: Relationship of cocontraction

Damiano, Diane L.; Martellotta, Tracy L.; Sullivan, Daniel J.; Granata, Kevin P.; Abel, Mark F.

doi:10.1053/apmr.2000.5579

Cited by 235 publications

(188 citation statements)

References 14 publications

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“…Mean MVC torque was significantly reduced for participants with CP in both the TA and GAS (Table II). Damiano et al (2000Damiano et al ( , 2001 found concentric peak torque for the TA and GAS reduced by a similar amount in participants with diplegic and hemiplegic spastic CP. These results suggest that muscle weakness in the TA and GAS is an important factor that may limit motor performance in spastic CP, and may contribute to gait disorders.…”

Section: Discussionmentioning

confidence: 93%

Neuromuscular activation and motor-unit firing characteristics in cerebral palsy

Rose

McGill

2007

Developmental Medicine &Amp; Child Neurology

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Muscle strength, neuromuscular activation, and motor-unit firing characteristics (firing rate, recruitment, and short-term synchronization) were assessed during voluntary contractions of the medial gastrocnemius (GAS) and tibialis anterior (TA) muscles of 10 participants with spastic diplegic or hemiplegic cerebral palsy (CP). The participants (six females, four males; age range 6 to 37y) walked with equinus gait at Gross Motor Function Classification System levels II to III. These were compared with 10 age-matched controls (five females; age range 7 to 35y). Neuromuscular activation was estimated by the ratio of surface electromyogram amplitude to M-wave amplitude elicited by supramaximal electrical nerve stimulation. Participants with CP produced significantly less torque (normalized by leg length) compared with controls (TA: mean 2.3, SD 1.6 vs mean 8.9, SD 3.4N m/m; GAS mean 13.7, SD 7.1 vs mean 28.6, SD 5.1Nm/m, p<0.001). Neuromuscular activation during maximum voluntary contraction was significantly reduced in the participants with CP compared with controls (mean 2.4, SD 1.5 vs mean 9.7, SD 2.7Nm/m for TA; mean 1.04, SD 0.41 vs mean 3.1, SD 1.2Nm/m for GAS, p<0.001). When compared at the same submaximal level of neuromuscular activation, motor-unit recruitment and firing rates were not different between the groups, although short-term synchronization in TA was reduced in the participants with CP. These data indicate that weakness, known to be an important component of the motor deficit in CP, has a strong central component. Although the relation between recruitment and firing rate remained substantially intact at the low and moderate force contractions tested, results suggest that the participants with CP were unable to recruit higher threshold motor units or to drive lower threshold motor units to higher firing rates.

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Section: Discussionmentioning

confidence: 93%

Neuromuscular activation and motor-unit firing characteristics in cerebral palsy

Rose

McGill

2007

Developmental Medicine &Amp; Child Neurology

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“…Since the use of MVICs is the most valid method to normalize EMG data allowing comparison of activity levels between muscles in different individuals, it should be the normalization method of choice when evaluating muscle function in clinical populations provided symptomatic individuals can produce MVICs. Indeed recent studies have shown that individuals from some clinical populations (moderate knee osteoarthritis [58], following knee surgery [103], back pain [104,105], cerebral palsy [106], stroke [45,107]), are able to produce maximum activation levels using the same MVIC tests as healthy individuals [8]. If symptomatic individuals are unable to elicit maximal contractions, e.g.…”

Section: Emg Normalization In Clinical Populationsmentioning

confidence: 99%

Normalization of EMG Signals: To Normalize or Not to Normalize and What to Normalize to?

Halaki¹,

Ginn²

2012

Computational Intelligence in Electromyography Analysis - A Perspective on Current Applications and Future Challenges

238

173

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“…As duas áreas EMG foram sobrepostas e o IC foi obtido pela razão entre o mínimo valor EMG pelo máximo valor EMG em cada ponto no tempo (o valor mínimo e máximo se alteravam durante o ciclo) e então, fazendo a razão média do período (DAMIANO; MARTELLOTA; SULLIVAN; GRANATA; ABEL, 2000). Se a contração dos dois músculos é simultânea o IC é 100%.…”

Section: Processamento E Análise Dos Dadosunclassified

“…Acredita-se que crianças PC com maior comprometimento motor e funcional apresentem maior coativação durante a marcha. Os possíveis efeitos negativos de uma excessiva ativação muscular incluem grande ativação muscular total durante a produção da força e alterações na qualidade e quantidade de movimento devido ao acréscimo na rigidez articular (DAMIANO; MARTELLOTA; SULLIVAN; GRANATA; ABEL, 2000 Fatores relacionados com as habilidades funcionais, função motora ampla e coativação muscular são determinantes no planejamento de intervenções e no conhecimento de como a criança interage na sociedade (BECKUNG;HAGBERG, 2002). A diminuição da coativação pode indicar maior habilidade na locomoção humana com maior controle da força e do equilíbrio, indicando neuromaturação (OKAMOTO; OKAMOTO;ANDREW, 2003).…”

Section: Crianças Com Pcunclassified

Coativação, espasticidade, desempenho motor e funcional na paralisia cerebral

Assumpção

Piucco

Corrêa

et al. 2011

Motriz: rev. educ. fis.

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O objetivo deste estudo foi verificar a associação entre a coativação muscular durante a marcha, a espasticidade, as habilidades funcionais e a função motora ampla em crianças com paralisia cerebral (PC) e comparar estes parâmetros com os de crianças com desenvolvimento típico (DT). Participaram do estudo 16 crianças com DT e 23 com PC. Os instrumentos clínicos utilizados foram: a Escala Modificada de Ashworth para espasticidade, o Pediatric Evaluation of Disability Inventory para habilidades funcionais, o Gross Motor Function Measure para função motora ampla. A ativação dos músculos reto femoral e semitendíneo foi analisada durante o ciclo de marcha por meio do cálculo do Índice de Coativação (IC). As medidas de habilidades funcionais e motricidade ampla apresentaram associação entre si, sendo bons indicadores de alterações motoras. O IC não parece ser um bom parâmetro para indicar ções na função motora em crianças com PC de severidade mínima.

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Muscle force production and functional performance in spastic cerebral palsy: Relationship of cocontraction

Cited by 235 publications

References 14 publications

Neuromuscular activation and motor-unit firing characteristics in cerebral palsy

Neuromuscular activation and motor-unit firing characteristics in cerebral palsy

Normalization of EMG Signals: To Normalize or Not to Normalize and What to Normalize to?

Coativação, espasticidade, desempenho motor e funcional na paralisia cerebral

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