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Compensatory control between the legs in automatic postural responses to stance perturbations under single-leg fatigue.
Rinaldin, Carla Daniele Pacheco; Avila de Oliveira, Júlia; Ribeiro de Souza, Caroline; Scheeren, Eduardo Mendonça; Coelho, Daniel Boari; Teixeira, Luis Augusto.
Afiliação
  • Rinaldin CDP; Graduate Program on Health Technology, Pontifical Catholic University of Paraná, St. Imaculada Conceição, 1155, Prado Velho, Curitiba, Paraná, 80215-901, Brazil. rinaldin99@gmail.com.
  • Avila de Oliveira J; Human Motor Systems Laboratory, School of Physical Education and Sport, University of São Paulo, Av. Professor Mello Moraes, 65, Butantã, São Paulo, 05508-030, Brazil.
  • Ribeiro de Souza C; Human Motor Systems Laboratory, School of Physical Education and Sport, University of São Paulo, Av. Professor Mello Moraes, 65, Butantã, São Paulo, 05508-030, Brazil.
  • Scheeren EM; Graduate Program on Health Technology, Pontifical Catholic University of Paraná, St. Imaculada Conceição, 1155, Prado Velho, Curitiba, Paraná, 80215-901, Brazil.
  • Coelho DB; Human Motor Systems Laboratory, School of Physical Education and Sport, University of São Paulo, Av. Professor Mello Moraes, 65, Butantã, São Paulo, 05508-030, Brazil.
  • Teixeira LA; Biomedical Engineering, Federal University of ABC, Av. da Universidade, Anchieta, São Bernardo do Campo, São Paulo, 09606-045, Brazil.
Exp Brain Res ; 239(2): 639-653, 2021 Feb.
Article em En | MEDLINE | ID: mdl-33388814
In response to sudden perturbations of stance stability, muscles of both legs are activated for balance recovery. In conditions that one of the legs has a reduced capacity to respond, the opposite leg is predicted to compensate by responding more powerfully to restore stable upright stance. In this investigation, we aimed to evaluate between-leg compensatory control in automatic postural responses to sudden perturbations in a situation in which plantar flexor muscles of a single leg were fatigued. Young participants were evaluated in response to a series of perturbations inducing forward body sway, with a focus on activation of plantar flexor muscles: lateral and medial gastrocnemii and soleus. Muscular responses were analyzed through activation magnitude and latency of muscular activation onset. For evaluation of balance and postural stability, we also analyzed the center of pressure and upper trunk displacement and weight-bearing asymmetry between the legs. Responses were assessed in three conditions: pre-fatigue, under single-leg fatigue, and following the recovery of muscular function. Results showed (a) compensation of the non-fatigued leg through the increased magnitude of muscular activation in the first perturbation under fatigue; (b) adaptation in the non-fatigued leg over repetitive perturbations, with a progressive decrement of muscular activation over trials; and (c) maintenance of increased muscular activation of the non-fatigued leg following fatigue dissipation. These findings suggest that the central nervous system is able to modulate the descending motor drive individually for each leg's muscles apparently based on their potential contribution for the achievement of the behavioral aim of recovering stable body balance following stance perturbations.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Equilíbrio Postural / Perna (Membro) Tipo de estudo: Prognostic_studies Limite: Humans Idioma: En Revista: Exp Brain Res Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Brasil País de publicação: Alemanha

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Equilíbrio Postural / Perna (Membro) Tipo de estudo: Prognostic_studies Limite: Humans Idioma: En Revista: Exp Brain Res Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Brasil País de publicação: Alemanha