Detalhes bibliográficos
| Ano de defesa: |
2016 |
| Autor(a) principal: |
Lehnen, Georgia Cristina
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| Orientador(a): |
Vieira, Marcus Fraga
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| Banca de defesa: |
Barbieri , Fábio Augusto,
Campos, Mário Hebling |
| Tipo de documento: |
Dissertação
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| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Federal de Goiás
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| Programa de Pós-Graduação: |
Programa de Pós-graduação em Ciências da Saúde (FM)
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| Departamento: |
Faculdade de Medicina - FM (RG)
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| País: |
Brasil
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| Palavras-chave em Português: |
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| Palavras-chave em Inglês: |
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| Área do conhecimento CNPq: |
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| Link de acesso: |
http://repositorio.bc.ufg.br/tede/handle/tede/6819
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Resumo: |
The muscle fatigue can cause sensorimotor and biomechanical deficits and may induce changes in the stability and the variability of gait, since its impact is not simply a decline in the production of force. Considering the contribution of the triceps sural to several activities such as locomotion (propulsion), it is clear how relevant it is to study how muscular fatigue, in this musculature, can affect the gait stability and the variability. The evaluation of these gait variables in conditions of localized muscular fatigue by means of non-linear methods and biomechanical descriptors can be efficient to deep the knowledge about the control and adaptation of the neuromuscular system in the walk/ locomotion. Thus, the results of the present study show the effects of localized muscle fatigue and can be applied to the condition of intense physical exercise, muscular response and therapeutic behavior, since understanding these effects on gait can help prevent falls and injuries and, as such, improve the quality of life of people. The general objective of the present study was to analyze the effects of unilateral fatigue of the triceps surae on gait stability and variability, as well as to investigate the recovery time of the variables analyzed after fatigue in women practitioners and nonpractitioners of strength training. Twenty women practitioners (PG) and 21 non-practitioners (NG) participated in the study, that performed a unilateral protocol of fatigue of the plantar flexors, triceps surae, and four walks of four minutes on the treadmill, one prior to the fatigue protocol and three later, with an interval of two minutes between each of them to verify recovery. The greatest findings of the present study demonstrated that local stability improvement in the anteroposterior direction after fatigue for both groups, in which only the PG recovered after 12 minutes. For global stability, both groups showed a significant increase in the anteroposterior direction, but without recovery. Regarding the spatiotemporal parameters, a significant decrease of the step length was observed only for NG, but with recovery after six minutes. There was a significant increase in the step frequency for the groups immediately after the fatigue, with recovery for both six minutes thereafter. It was observed a significant increase in variability in all directions for both groups. In the mediolateral direction only the NG presented recovery and in the six minutes after the fatigue; in the anteroposterior direction the two groups did not recover, while in the vertical direction the two recovered six minutes after the fatigue. For all gait variables studied, there was no interaction effect between the effect of muscle fatigue and the training condition. It was observed that the participants presented changes in gait stability and variability, with adaptations of the spatiotemporal parameters analyzed in the presence of muscle fatigue of triceps surae, and that 12 minutes seem not to be sufficient for total recovery. It is concluded that the groups studied, grouped by the practice of strength training, did not present differences in relation to the muscular fatigue response of the triceps surae. It was concluded that participants were able to cope with muscle fatigue, adapting to maintain performance and safety of gait. Even so, the need for a recovery interval is emphasized, mainly due to the increase of variability and the incomplete recovery of variables, in order to minimize the risk of injuries and falls in individuals subject to muscle fatigue at work or in sports. Thus, it is suggested that training programs include fatiguing resistance exercises to make the body fit to adapt to the presence of fatigue, and that in the therapeutic practice, the professionals should pay attention to the effects of fatigue in order to obtain better results. |
