Orientador: Tamotsu Hirata / Banca: José Elias Tomazini / Banca: Rubens Alexandre da Silva Júnior / Banca: Fabiano Politti / Banca: Daniela Aparecida Biasotto Gonzalez / Resumo: O controle postural é um fator determinante na execução de gestos funcionais que necessitam de um alto desempenho da coordenação motora, como por exemplo, nas atividades esportivas. Neste presente trabalho foi abordada a modalidade esportiva do futebol, e de forma mais específica, o gesto técnico do chute. Neste sentido, o objetivo deste trabalho foi de investigar o equilíbrio dinâmico durante o chute futebolístico por meio de um sistema de análise com uma tarefa controlada. O sistema proposto foi constituído por um dispositivo disparador vertical de bola, alvo de acerto, sistema de aquisição de sinais com eletromiografia, acelerômetria, registro do instante do acionamento do disparador, e por uma plataforma de força. A amostra foi constituída por 11 atletas profissionais de futsal, os quais realizaram a tarefa de vinte e cinco chutes ao alvo com a bola em movimento vertical. Para análise dos dados foi proposta a identificação e análise do comportamento dos sinais dos músculos Glúteo média (GM), Tibial anterior (TA), Fibular longo (FL) e Vasto lateral (VL), em relação às variáveis estabilométricas do equilíbrio postural no pré-chute, durante o chute e após-chute. Foram apresentados os gráficos das médias das variáveis estabilométricas: posição média, desvio padrão, deslocamento total, amplitude, velocidades, freqüências médias e freqüências medianas na direção ântero-posterior (AP) e médio-lateral (ML), centro de pressão (COP) e respectiva direção de oscilação, desenvolvidas durante a execução da tarefa controlada do chute. Os resultados apresentaram o comportamento das médias dos valores RMS (root mean square) dos músculos glúteo médio (GL), tibial anterior (TA), fibular longo (FL) e vasto lateral (VL) no pré-chute, durante o chute e pós-chute em relação a análise postural através do COP... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Postural control is a determining factor in the execution of functional movements that require a high performance of the motor control coordination, such as sporting activities. In this study the soccer sports activity was chosen, and more specifically, the technical movement of the kick. The objective this study was to investigate the postural sway through the kick's movement control. A vertical ball shooting machine (VBS) with an active target was especially developed to measure the effectiveness of the kick. This system was synchronized with electromyographic signal, accelerometer and force platform in order to recognize the movement. Eleven professional athletes of soccer kicked the ball twenty-five times on target using the VBS system by EMG System do Brasil. Data analysis was proposed for identification and correlation of the signal behavior of the middle gluteus muscle (GM), tibialis anterior (TA), peroneus longus (FL) and vastus lateralis (VL) in relation stabilometric variables of postural sway before the kick, during the kick and after the kick. It was analysed of stabilometric variables: the mean position, standard deviation, total displacement, amplitude, speed, median frequencies in the anteroposterior (AP) and mediolateral (ML) of the center of pressure (COP ) and direction of oscillation during the controlled kick. The results showed the same trends in the behavior of the RMS (root mean square) of the gluteus medius muscle (LG), tibialis anterior (TA), peroneus longus (FL) and vastus lateralis (VL) before the kick during the kick and after the kick. This was also observed in the analysis of the variables stabilometric, standard deviation, speed, median frequency in anteroposterior (AP) and mediolateral (ML). Considering the results of this study, analysis of the behavior of EMG signals of the muscles involved in... (Complete abstract click eletronic access below) / Doutor

Made available in DSpace on 2014-06-11T19:34:58Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-01-23Bitstream added on 2014-06-13T20:05:58Z : No. of bitstreams: 1 amorim_cf_dr_guara.pdf: 1558739 bytes, checksum: cf912517af4f1c4f658892c975ee2aa1 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / O controle postural é um fator determinante na execução de gestos funcionais que necessitam de um alto desempenho da coordenação motora, como por exemplo, nas atividades esportivas. Neste presente trabalho foi abordada a modalidade esportiva do futebol, e de forma mais específica, o gesto técnico do chute. Neste sentido, o objetivo deste trabalho foi de investigar o equilíbrio dinâmico durante o chute futebolístico por meio de um sistema de análise com uma tarefa controlada. O sistema proposto foi constituído por um dispositivo disparador vertical de bola, alvo de acerto, sistema de aquisição de sinais com eletromiografia, acelerômetria, registro do instante do acionamento do disparador, e por uma plataforma de força. A amostra foi constituída por 11 atletas profissionais de futsal, os quais realizaram a tarefa de vinte e cinco chutes ao alvo com a bola em movimento vertical. Para análise dos dados foi proposta a identificação e análise do comportamento dos sinais dos músculos Glúteo média (GM), Tibial anterior (TA), Fibular longo (FL) e Vasto lateral (VL), em relação às variáveis estabilométricas do equilíbrio postural no pré-chute, durante o chute e após-chute. Foram apresentados os gráficos das médias das variáveis estabilométricas: posição média, desvio padrão, deslocamento total, amplitude, velocidades, freqüências médias e freqüências medianas na direção ântero-posterior (AP) e médio-lateral (ML), centro de pressão (COP) e respectiva direção de oscilação, desenvolvidas durante a execução da tarefa controlada do chute. Os resultados apresentaram o comportamento das médias dos valores RMS (root mean square) dos músculos glúteo médio (GL), tibial anterior (TA), fibular longo (FL) e vasto lateral (VL) no pré-chute, durante o chute e pós-chute em relação a análise postural através do COP... / Postural control is a determining factor in the execution of functional movements that require a high performance of the motor control coordination, such as sporting activities. In this study the soccer sports activity was chosen, and more specifically, the technical movement of the kick. The objective this study was to investigate the postural sway through the kick’s movement control. A vertical ball shooting machine (VBS) with an active target was especially developed to measure the effectiveness of the kick. This system was synchronized with electromyographic signal, accelerometer and force platform in order to recognize the movement. Eleven professional athletes of soccer kicked the ball twenty-five times on target using the VBS system by EMG System do Brasil. Data analysis was proposed for identification and correlation of the signal behavior of the middle gluteus muscle (GM), tibialis anterior (TA), peroneus longus (FL) and vastus lateralis (VL) in relation stabilometric variables of postural sway before the kick, during the kick and after the kick. It was analysed of stabilometric variables: the mean position, standard deviation, total displacement, amplitude, speed, median frequencies in the anteroposterior (AP) and mediolateral (ML) of the center of pressure (COP ) and direction of oscillation during the controlled kick. The results showed the same trends in the behavior of the RMS (root mean square) of the gluteus medius muscle (LG), tibialis anterior (TA), peroneus longus (FL) and vastus lateralis (VL) before the kick during the kick and after the kick. This was also observed in the analysis of the variables stabilometric, standard deviation, speed, median frequency in anteroposterior (AP) and mediolateral (ML). Considering the results of this study, analysis of the behavior of EMG signals of the muscles involved in... (Complete abstract click eletronic access below)

Knowing where and when to look is critical for effective performance of visually guided tasks. A gaze strategy termed the quiet eye (QE; the final gaze before the onset of a critical movement) is strongly associated with motor skill proficiency, with earlier and longer QE periods leading to improved visuomotor control. Children with poor motor proficiency, such as those with Developmental Coordination Disorder (DCD), have impairments in the pick-up and processing of visual information, translating into poorly coordinated movements. The purpose of this project therefore was to perform the first examination of the QE strategy in children of different motor coordination abilities and furthermore to investigate the efficacy of task-specific QE training (QET) to improve the skills of children with and without DCD beyond the effects of a standard coaching technique. Study 1 determined that children with low motor coordination had later, shorter QE durations in comparison to coordinated children and as a result, performed worse in a specified motor task (throwing and catching). Study 2 therefore performed two experiments aimed at developing an appropriate but brief QET protocol for children to improve their throwing and catching ability. These experiments found that typically developing children were able to increase their QE durations with QET and this was reflected in a durable improvement in their motor skill execution. The final study examined this QET intervention in children with DCD. This was the first application of QET in a clinical population, and found that children with DCD were able to improve their QE durations, and make robust changes to their visuomotor control. These studies associate a longer QE with motor skill proficiency in children, and provide an important adjunct to current therapeutic intervention for children with poorly developed motor skills.