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Previous issue date: 2017-12-15 / Introdu??o: Os idosos tendem a apresentar redu??o no trofismo, na amplitude de ativa??o muscular e na for?a, o que pode impactar negativamente na sua funcionalidade. Estudos t?m sido realizados com exerc?cios na plataforma vibrat?ria, por?m, existe uma escassez na literatura no que se refere aos poss?veis efeitos neurofisiol?gicos agudos desta t?cnica em sujeitos idosos. Objetivo: Analisar os efeitos agudos de uma sess?o de exerc?cio na plataforma vibrat?ria sobre o desempenho neuromuscular dos membros inferiores em idosos. M?todos: Trata-se de um ensaio controlado, randomizado e cego, no qual 44 volunt?rios, de ambos os sexos, com idade m?dia de 68,5 ? 2,67 anos, foram submetidos a uma avalia??o da oscila??o postural (baropodometria), do desempenho isocin?tico e da atividade eletromiogr?fica dos m?sculos vasto lateral (VL) e s?leo, do membro dominante. Em seguida, foram distribu?dos aleatoriamente em dois grupos, com 22 participantes cada: grupo placebo (GP) ? executou um protocolo de exerc?cio com a plataforma desligada; e grupo experimental (GE) ? realizou um protocolo de exerc?cio com a plataforma ligada, numa frequ?ncia de 40 Hz e amplitude pico a pico de 4 mm. Ambos os grupos realizaram o mesmo protocolo de exerc?cios na plataforma, composto por 4 s?ries de 90 segundos de dura??o e intervalo de repouso de 1 minuto, em semi-agachamento bipodal est?tico, a 400 de flex?o de joelho. Ao final das interven??es os volunt?rios foram submetidos a uma reavalia??o id?ntica a realizada antes do protocolo de exerc?cios. Os dados foram analisados no software SPSS 21.0, atribuindo-se n?vel de signific?ncia de 5% (p ? 0,05). Para an?lise da normalidade dos dados foi usado o teste de Kolmogorov-Smirnov e para atestar a homogeneidade entre os grupos foi utilizado um teste ?t? para medidas independentes. Para compara??o intra e intergrupo foi utilizada uma ANOVA modelo misto. Resultados: Houve diferen?a significativa intergrupo no valor do RMS para o VL e intragrupo no RMS do s?leo, ap?s o protocolo de interven??o no GE. Na avalia??o do desempenho isocin?tico, o pico de torque dos extensores do joelho apresentou aumento intragrupo no GE e nos flexores plantares foi observado aumento intragrupo para o GP e GE; para a vari?vel pot?ncia houve aumento intragrupo, em ambos os grupos. N?o foi observada diferen?a significativa na oscila??o postural. Conclus?o: O protocolo de exerc?cio na plataforma vibrat?ria promove um maior recrutamento neuromuscular do vasto lateral em indiv?duos idosos. Entretanto, de maneira imediata, n?o foram observadas altera??es na oscila??o postural, nem no desempenho isocin?tico desses sujeitos. / Background: Elderly people tend to present a decrease of the trophism, amplitude of muscular activation and strength, which causes significant negative implications in their functionality. Studies about exercise on the whole body vibration have been performed, however, there is a lack in the literature regarding the possible neurophysiological acute effects of this technique in elderly people. Objective: To analyze the immediate effects of an exercise session on the vibratory platform on the lower limb neuromuscular performance of elderly. Methods: This is a ramdomized, blind, controlled trial, in wich 44 volunteers, of both genders, mean age of 68,5 ? 2,67 years, were submitted to an evaluation of the postural oscillation (baropodometry), isocinetic performance and electromyographic activity of the vastus lateralis (VL) and soleus muscle of the dominant limb. After, they were randomly assigned in two groups, with 22 participants each: placebo group (PG) ? underwent a series of exercises with the vibrating platform off; and experimental group (EG) - underwent a series of exercises with the vibrating platform on, configured at frequency of 40 Hz and a displacement amplitude of 4 mm. Both groups executed the same exercise protocol in the platform, composed of a bipodal isometric squat at 400 of knee flexion, being 4 series of 90 seconds of duration, with interval of 1 minute. At the end of the intervention, the volunteers were submitted to a re-evaluation identical to the previous performed before the exercise protocol. Data were analyzed using SPSS 21.0 software, assigning a level of significance of 5% (p ? 0,05). To the analysis of normality of data it was used the Kolmogorov-Smirnov test and to attest the homogeneity between groups, a paired-sample test t. To analyze the differences between and within group, it was used a mixed model ANOVA. Results: There was a significant between-group increase in RMS for the VL and within group for soleus RMS after the intervention protocol in the EG. For isokinetic performance, there was an within group increase in peak torque of knee extensors on EG and of plantar flexors on PG and EG; for the variable power, there was an within group increase in both groups. It was not observed significant differences on postural oscillation. Conclusion: The protocol of exercise on the whole-body vibration promotes a greater neuromuscular recruitment of VL muscles in elderly. However, it was not observed immediate effects on postural oscillation or in isokinetic performance in this population.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/24879 |
| Date | 15 December 2017 |
| Creators | Bulh?es, Lidiane Cristina Correia |
| Contributors | 58440097468, Sousa, Catarina de Oliveira, 01214947484, Ferreira, Jos? Jamacy de Almeida, 24372110472, Brasileiro, Jamilson Sim?es |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM FISIOTERAPIA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| 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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