Ivan Pacheco

Avaliação do tempo de resposta eletromiográfica em atletas de voleibol e não atletas que sofreram entorse de tornozelo

The purpose of this study was to examine the time for the electromyographic response of the fibular muscles in the sudden foot inversion in sprained and healthy ankles. Three groups of athletes were tested: one composed by healthy athletes (group 1), one group of athletes with recent history of ankle sprain (group 2), and another group composed by non-athletes with recent history of ankle sprain (group 3). For each individual from the three groups both ankles were tested. Individuals with ankle sprain (groups 2 and 3) were asymptomatic for the last two months prior to the test. A platform able to produce a sudden 20o side inversion of the ankle in the frontal plane simulated an ankle sprain event. Surface electromyography electrodes were placed over the fibular muscles. Times for the electromyographic response of the fibular muscles were obtained and compared between groups. In group 1, the mean electromyographic response times were: 71 ms for the right leg, and 69 ms for the left leg. In group 2, the mean electromyographic response times were: 72 ms for non-sprained ankle, and 74 ms for sprained ankle. In group 3, the mean electromyographic response times were: 72 ms for non-sprained ankle and 73 ms for sprained ankle. Results indicated no statistically significant difference between the right and left legs in group 1, and between non-sprained and sprained ankle in groups 2 and 3 for the fibular muscles. The findings in the present study suggest that the time for the electromyographic response of the fibular muscles to sudden angular displacement of the ankle was not influenced by the ankle sprain.

Efeitos da fadiga muscular induzida por exercícios no tempo de reação muscular dos fibulares em indivíduos sadios

A fadiga muscular (FM) e um fenomeno comum nas atividades esportivas e diarias, resultando numa piora da performance motora. Ela e considerada um dos fatores causadores de lesoes musculo-esqueleticas. A entorse de tornozelo e um exemplo: a FM afetaria tanto o sistema aferente quanto o eferente. Varios estudos tem analisado a influencia da FM no controle neuromuscular (CNM); entretanto, existe pouca pesquisa sobre essa influencia na velocidade de reacao dos musculos. O objetivo deste estudo foi verificar os efeitos da FM no tempo de reacao muscular (TRM) dos musculos fibulares, que sao os primeiros a responder a um estresse em inversao do tornozelo. Foram estudados 14 individuos saudaveis masculinos (idade: 20-35 anos), que tiveram seus TRM avaliados por meio de eletromiografia (EMG) de superficie. O inicio da atividade muscular foi definido como a media de repouso + 3x o desvio-padrao (DP). O TRM dos fibulares foi mensurado apos uma inversao subita de 20o realizada numa plataforma. A inversao subita foi realizada antes e depois da fadiga muscular, que foi induzida por exercicios localizados dos fibulares ate a exaustao. Os resultados mostraram que houve um aumento significativo do tempo de reacao muscular apos a fadiga (p < 0,01). Durante atividades esportivas prolongadas e durante o processo de reabilitacao, deve-se ter cautela na realizacao de tarefas que requeiram respostas musculares extremamente rapidas sob condicoes de fadiga muscular.The muscular fatigue (MF) is a common phenomenon in the daily sports activities that results in a worsening of the motor performance. It is considered one of the major factors for muscle-skeletal damages, such as the ankle sprain, when the MF would affect both the afferent and the efferent systems. Several studies have been analyzing the influence of the MF on the neuromuscular control (NMC). Nevertheless, there are few researches comprising that influence on the velocity of the muscular reaction. The purpose of this study was to check the effects of the MF on the time of the muscular reaction (TMR) in the fibularis muscles, which are the first to respond to an inversion stress of the ankle. Fourteen healthy male individuals (age: 20-35 years) were studied, who had their TMR assessed by means of the surface electromyography (EMG). The beginning of the muscular activity was defined as the mean resting value +3x the standard deviation (SD). The TMR of the fibularis was measured after a sudden 20o inversion performed on a platform. The sudden inversion was performed before and after the muscular fatigue, which was induced through localized exercises of the fibularis up to the exhaustion. The results have shown a significant increase in the time of the muscular reaction after the fatigue (p < 0.01). While performing prolonged sportive activities and during the rehabilitation process, there must be caution to perform tasks that require extremely fast muscular responses.

Effects of the exercise-induced muscular fatigue on the time of muscular reaction of the fibularis in healthy individuals

A fadiga muscular (FM) e um fenomeno comum nas atividades esportivas e diarias, resultando numa piora da performance motora. Ela e considerada um dos fatores causadores de lesoes musculo-esqueleticas. A entorse de tornozelo e um exemplo: a FM afetaria tanto o sistema aferente quanto o eferente. Varios estudos tem analisado a influencia da FM no controle neuromuscular (CNM); entretanto, existe pouca pesquisa sobre essa influencia na velocidade de reacao dos musculos. O objetivo deste estudo foi verificar os efeitos da FM no tempo de reacao muscular (TRM) dos musculos fibulares, que sao os primeiros a responder a um estresse em inversao do tornozelo. Foram estudados 14 individuos saudaveis masculinos (idade: 20-35 anos), que tiveram seus TRM avaliados por meio de eletromiografia (EMG) de superficie. O inicio da atividade muscular foi definido como a media de repouso + 3x o desvio-padrao (DP). O TRM dos fibulares foi mensurado apos uma inversao subita de 20o realizada numa plataforma. A inversao subita foi realizada antes e depois da fadiga muscular, que foi induzida por exercicios localizados dos fibulares ate a exaustao. Os resultados mostraram que houve um aumento significativo do tempo de reacao muscular apos a fadiga (p < 0,01). Durante atividades esportivas prolongadas e durante o processo de reabilitacao, deve-se ter cautela na realizacao de tarefas que requeiram respostas musculares extremamente rapidas sob condicoes de fadiga muscular.The muscular fatigue (MF) is a common phenomenon in the daily sports activities that results in a worsening of the motor performance. It is considered one of the major factors for muscle-skeletal damages, such as the ankle sprain, when the MF would affect both the afferent and the efferent systems. Several studies have been analyzing the influence of the MF on the neuromuscular control (NMC). Nevertheless, there are few researches comprising that influence on the velocity of the muscular reaction. The purpose of this study was to check the effects of the MF on the time of the muscular reaction (TMR) in the fibularis muscles, which are the first to respond to an inversion stress of the ankle. Fourteen healthy male individuals (age: 20-35 years) were studied, who had their TMR assessed by means of the surface electromyography (EMG). The beginning of the muscular activity was defined as the mean resting value +3x the standard deviation (SD). The TMR of the fibularis was measured after a sudden 20o inversion performed on a platform. The sudden inversion was performed before and after the muscular fatigue, which was induced through localized exercises of the fibularis up to the exhaustion. The results have shown a significant increase in the time of the muscular reaction after the fatigue (p < 0.01). While performing prolonged sportive activities and during the rehabilitation process, there must be caution to perform tasks that require extremely fast muscular responses.

Relationship between intrinsic and extrinsic risk factors and the prevalence of lower limb injuries in basketball and volleyball athletes

Introducao: Os atletas estao sujeitos a sofrerem lesoes, tanto nos treinos como em competicoes. Estas lesoes estao diretamente relacionadas a fatores predisponentes intrinsecos e extrinsecos e a ausencia de um programa preventivo. Objetivo: O objetivo deste trabalho foi, apos identificar fatores de risco intrinsecos e extrinsecos, relaciona-los com a prevalencia de lesoes em membros inferiores de atletas de voleibol e basquetebol de um clube na capital gaucha. Materiais e Metodos: Participaram da pesquisa 46 atletas, sendo 23 da modalidade de basquetebol (todos do genero masculino) e 23 do voleibol (13 do genero feminino e 10 do genero masculino). A pesquisa considerou alguns dos principais fatores intrinsecos descritos pela literatura, sendo estes, genero, idade, peso e estatura, lesao pregressa e alguns fatores extrinsecos: modalidade esportiva, tempo de pratica, frequencia e duracao de treinos e utilizacao de material de protecao. Os dados referentes a fatores de risco foram respondidos pelos atletas atraves de um questionario e dados referentes a lesoes pregressas foram adquiridos atraves das fichas do departamento medico e de fisioterapia do clube. Resultados: Nos resultados, o fator intrinseco lesao pregressa (p=0,004) e o fator extrinseco tempo de pratica da modalidade (p=0,001) apresentaram influencia significativa. Conclusao: Observou-se a necessidade de mais investigacoes frente aos fatores de risco na literatura, para que possa ser melhore identificada a relacao entre fatores de risco e prevalencia de lesoes em atletas, a fim de elaborar programas de prevencao especificos para os fatores identificados.

Evaluation of the time for the electromyographic response in volleyball athletes and non-athletes who had ankle sprain

The purpose of this study was to examine the time for the electromyographic response of the fibular muscles in the sudden foot inversion in sprained and healthy ankles. Three groups of athletes were tested: one composed by healthy athletes (group 1), one group of athletes with recent history of ankle sprain (group 2), and another group composed by non-athletes with recent history of ankle sprain (group 3). For each individual from the three groups both ankles were tested. Individuals with ankle sprain (groups 2 and 3) were asymptomatic for the last two months prior to the test. A platform able to produce a sudden 20o side inversion of the ankle in the frontal plane simulated an ankle sprain event. Surface electromyography electrodes were placed over the fibular muscles. Times for the electromyographic response of the fibular muscles were obtained and compared between groups. In group 1, the mean electromyographic response times were: 71 ms for the right leg, and 69 ms for the left leg. In group 2, the mean electromyographic response times were: 72 ms for non-sprained ankle, and 74 ms for sprained ankle. In group 3, the mean electromyographic response times were: 72 ms for non-sprained ankle and 73 ms for sprained ankle. Results indicated no statistically significant difference between the right and left legs in group 1, and between non-sprained and sprained ankle in groups 2 and 3 for the fibular muscles. The findings in the present study suggest that the time for the electromyographic response of the fibular muscles to sudden angular displacement of the ankle was not influenced by the ankle sprain.

Efectos de la fatiga muscular inducida por ejercicios sobre el tiempo de reacción muscular peronea en individuos sanos

A fadiga muscular (FM) e um fenomeno comum nas atividades esportivas e diarias, resultando numa piora da performance motora. Ela e considerada um dos fatores causadores de lesoes musculo-esqueleticas. A entorse de tornozelo e um exemplo: a FM afetaria tanto o sistema aferente quanto o eferente. Varios estudos tem analisado a influencia da FM no controle neuromuscular (CNM); entretanto, existe pouca pesquisa sobre essa influencia na velocidade de reacao dos musculos. O objetivo deste estudo foi verificar os efeitos da FM no tempo de reacao muscular (TRM) dos musculos fibulares, que sao os primeiros a responder a um estresse em inversao do tornozelo. Foram estudados 14 individuos saudaveis masculinos (idade: 20-35 anos), que tiveram seus TRM avaliados por meio de eletromiografia (EMG) de superficie. O inicio da atividade muscular foi definido como a media de repouso + 3x o desvio-padrao (DP). O TRM dos fibulares foi mensurado apos uma inversao subita de 20o realizada numa plataforma. A inversao subita foi realizada antes e depois da fadiga muscular, que foi induzida por exercicios localizados dos fibulares ate a exaustao. Os resultados mostraram que houve um aumento significativo do tempo de reacao muscular apos a fadiga (p < 0,01). Durante atividades esportivas prolongadas e durante o processo de reabilitacao, deve-se ter cautela na realizacao de tarefas que requeiram respostas musculares extremamente rapidas sob condicoes de fadiga muscular.The muscular fatigue (MF) is a common phenomenon in the daily sports activities that results in a worsening of the motor performance. It is considered one of the major factors for muscle-skeletal damages, such as the ankle sprain, when the MF would affect both the afferent and the efferent systems. Several studies have been analyzing the influence of the MF on the neuromuscular control (NMC). Nevertheless, there are few researches comprising that influence on the velocity of the muscular reaction. The purpose of this study was to check the effects of the MF on the time of the muscular reaction (TMR) in the fibularis muscles, which are the first to respond to an inversion stress of the ankle. Fourteen healthy male individuals (age: 20-35 years) were studied, who had their TMR assessed by means of the surface electromyography (EMG). The beginning of the muscular activity was defined as the mean resting value +3x the standard deviation (SD). The TMR of the fibularis was measured after a sudden 20o inversion performed on a platform. The sudden inversion was performed before and after the muscular fatigue, which was induced through localized exercises of the fibularis up to the exhaustion. The results have shown a significant increase in the time of the muscular reaction after the fatigue (p < 0.01). While performing prolonged sportive activities and during the rehabilitation process, there must be caution to perform tasks that require extremely fast muscular responses.

Evaluación del tiempo de respuesta electromiográfica en atletas de voleibol y no atletas que han sufrido esguince de tobillo

The purpose of this study was to examine the time for the electromyographic response of the fibular muscles in the sudden foot inversion in sprained and healthy ankles. Three groups of athletes were tested: one composed by healthy athletes (group 1), one group of athletes with recent history of ankle sprain (group 2), and another group composed by non-athletes with recent history of ankle sprain (group 3). For each individual from the three groups both ankles were tested. Individuals with ankle sprain (groups 2 and 3) were asymptomatic for the last two months prior to the test. A platform able to produce a sudden 20o side inversion of the ankle in the frontal plane simulated an ankle sprain event. Surface electromyography electrodes were placed over the fibular muscles. Times for the electromyographic response of the fibular muscles were obtained and compared between groups. In group 1, the mean electromyographic response times were: 71 ms for the right leg, and 69 ms for the left leg. In group 2, the mean electromyographic response times were: 72 ms for non-sprained ankle, and 74 ms for sprained ankle. In group 3, the mean electromyographic response times were: 72 ms for non-sprained ankle and 73 ms for sprained ankle. Results indicated no statistically significant difference between the right and left legs in group 1, and between non-sprained and sprained ankle in groups 2 and 3 for the fibular muscles. The findings in the present study suggest that the time for the electromyographic response of the fibular muscles to sudden angular displacement of the ankle was not influenced by the ankle sprain.