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Previous issue date: 2010-05-14 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Muscle fatigue is a phenomenon that promotes physiological and biomechanical
disorders and their changes in healthy subjects have been widely studied and have
significant importance for care in preventing injuries, but we do not have many
information about its effects in patients after ACL reconstruction. Thus, this study is
to analyze the effects of fatigue on neuromuscular behavior of quadriceps after ACL
reconstruction. To reach this objective, participants were forty men, twenty healthy
(26,90 ? 6,29 years) and twenty after ACL reconstruction (29,75 ? 7,01 years) with a
graft of semitendinosus and gracilis tendons, between four to six months after
surgery. At first, there was an assessment of joint position sense (JPS) at the
isokinetic dynamometer at a speed of 5?/s and target angle of 45? to analyze the
absolute error of JPS. Next, we applied the a muscle fatigue protocol, running 100
repetitions of isokinetic knee flexion-extension at 90?/s. Concurrently with this
protocol, there was the assessment of muscle performance, as the peak torque (PT)
and fatigue index, and electromyographic activity (RMS and median frequency).
Finally, we repeated the assessment of JPS. The statistical analysis showed that
patients after ACL reconstruction have, even under normal conditions, the amended
JPS compared with healthy subjects and that after fatigue, both have disturbances in
the JPS, but this alteration is significantly exacerbated in patients after ACL
reconstruction. About muscle performance, we could notice that these patients have
a lower PT, although there are no differences between the dynamometric and EMG
fatigue index. These findings show the necessity about the cares of pacients with
ACL reconstruction in respect of the risks of articulate instability and overload in
ligamentar graft / A fadiga muscular ? um fen?meno que envolve dist?rbios fisiol?gicos e
biomec?nicos. A an?lise de suas altera??es, em indiv?duos sadios, possui grande
import?ncia na preven??o de les?es, mas pouco se sabe sobre suas repercuss?es
em pacientes ap?s reconstru??o do LCA. Dessa forma, o objetivo deste estudo foi
avaliar os efeitos da fadiga no comportamento neuromuscular do quadr?ceps femoral
de indiv?duos ap?s reconstru??o do LCA. Para tanto, participaram deste estudo
quarenta homens, sendo vinte saud?veis (26,90 ? 6,29 anos) e vinte ap?s
reconstru??o de LCA (29,75 ? 7,01 anos) com enxerto dos tend?es semitendinoso e
gr?cil, entre 4 a 6 meses de p?s-operat?rio. Em princ?pio, realizou-se uma avalia??o
do senso de posi??o articular (SPA) ativo, no dinam?metro isocin?tico, a uma
velocidade de 5?/s e ?ngulo-alvo de 45?, sendo a vari?vel analisada o seu erro
absoluto. Em seguida, aplicou-se uma avalia??o isom?trica m?xima em extens?o do
joelho, a 60? de flex?o, por 10 segundos e um protocolo de fadiga muscular, sendo
executadas 100 repeti??es isocin?ticas conc?ntricas de flexo-extens?o do joelho a
90?/s. Concomitantemente a esse protocolo, realizou-se a avalia??o do desempenho
muscular, observando o pico de torque (PT), o ?ndice de fadiga (IFD) e a atividade
eletromiogr?fica (Root Mean Square - RMS e freq??ncia mediana - Fm). Por fim,
repetiu-se a avalia??o da SPA. As avalia??es detectaram que pacientes ap?s
reconstru??o do LCA apresentaram, ainda em condi??es pr?-fadiga, o SPA alterado
quando comparado com indiv?duos sadios e que quando fatigados, ambos
possu?ram dist?rbios no SPA, sendo que essa altera??o foi significativamente mais
exacerbada em pacientes ap?s reconstru??o de LCA. Quanto ao desempenho
muscular, constatou-se que esses pacientes apresentam um menor PT, RMS e Fm
quando comparado ao grupo controle, mas n?o possuem diferen?as quanto ao
?ndice de fadiga, dado pela Fm e pela dinamometria. Ademais, constatou-se que as
vari?veis isocin?ticas e eletromiogr?ficas, em sua grande maioria, apresentam
correla??es positivas. Os achados refor?am a necessidade dos cuidados aos
pacientes ap?s reconstru??o do LCA, quando submetidos ? fadiga, no que diz
respeito aos riscos de instabilidade articular e sobrecarga do enxerto ligamentar
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/16691 |
| Date | 14 May 2010 |
| Creators | Maciel, N?cia Farias Braga |
| Contributors | CPF:58440097468, http://lattes.cnpq.br/2238444079880883, Guirro, Rinaldo Roberto de Jesus, CPF:16719850873, http://lattes.cnpq.br/4966448047381105, Ferreira, Jos? Jamacy Almeida, CPF:24372110472, http://lattes.cnpq.br/7942403520160630, Brasileiro, Jamilson Sim?es |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Fisioterapia, UFRN, BR, Movimento e Sa?de |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | Portuguese |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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