Efeito do step-training no aumento da força muscular em mulheres idosas saudáveis

Effect of a step-training program on muscle strength in older women

ARTIGO ORIGINAL

Efeito do step-training no aumento da força muscular em mulheres idosas saudáveis

Effect of a step-training program on muscle strength in older women

Daniela Coelho Zazá^I; Hans-Joachim Karl Menzel^II; Mauro Heleno Chagas^II

^ICentro Universitário de Belo Horizonte. Departamento de Ciências Biológicas, Ambientais e da Saúde. Laboratório de Biomecânica, Belo Horizonte, MG. Brasil.

^IIUniversidade Federal de Minas Gerais. Departamento de Esportes. Laboratório de Biomecânica. Belo Horizonte. MG. Brasil.

^{Correspondencia para}

RESUMO

O step-training é uma atividade física associada com aumento da força de membros inferiores. A força muscular é um componente crítico para a manutenção da capacidade funcional. O objetivo deste estudo foi verificar o efeito de seis semanas de step-training nos parâmetros trabalho e potência de membros inferiores em mulheres idosas. Treze mulheres saudáveis e ativas se voluntariaram a participar do estudo. Todas foram submetidas a aulas de step-training, três vezes por semana, durante 60 minutos cada. As variáveis da força muscular dos extensores e flexores do joelho foram mensuradas por meio de um dinamômetro isocinético Biodex System 3 Pro. Trabalho e potência muscular foram mensurados nas velocidades angulares de 60 e 180°/s. Diferença significativa (p<0.05) foi encontrada no trabalho para os músculos flexores do joelho, entre o pré e pós-teste, nas velocidades de 60 e 180°/s. Houve diferença significativa (p<0.05) para o trabalho nos músculos extensores na comparação pré e pós-teste, na velocidade angular de 60°/s. Diferenças significativas foram observadas na potência muscular na comparação pré e pós-teste, para os músculos flexores na velocidade angular de 60°/s (p<0,05) e para os músculos extensores do joelho nas velocidades angulares de 60 e 180°/s (p<0,05). Concluindo, o step-training pode ser recomendado como uma atividade física alternativa para ser utilizada com pessoas idosas, objetivando aumento do desempenho de força (trabalho e potência) dos músculos extensores e flexores do joelho.

Palavras-chave: Trabalho; Envelhecimento; Treinamento

ABSTRACT

Step-training is associated with strength improvement of the lower limbs. Muscle strength is a critical component for the maintenance of functional capacity. The objective of the present study was to determine the effect of 6 weeks of step-training on work and power of the lower limbs in older women. Thirteen healthy and active women volunteered to participate in the study. All subjects underwent step-training classes three times per week for 60 min. Strength variables of the knee extensor and flexor muscles were measured with a Biodex System 3 Pro isokinetic dynamometer. Muscle work and power were assessed at an angular velocity of 60 and 180°/s. A significant difference (p<0.05) in knee flexor muscle work was observed between pre- and post-test at 60 and 180°/s. There was a significant difference (p<0.05) in knee extensor muscle work between pre- and post-test at 60°/s. Significant differences were observed between pre- and post-test values of knee flexor muscle power at 60°/s (p<0.05) and knee extensor muscle power at 60 and 180°/s (p<0.05). In conclusion, step-training can be recommended as an alternative physical activity to increase strength performance (work and power) of the knee extensor and flexor muscles in older subjects.

Keywords: Work; Aging; Training

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Recebido em 05/08/2009

Revisado em 17/10/2009

Aprovado em 18/12/2009

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Datas de Publicação

• Publicação nesta coleção
  10 Out 2012
• Data do Fascículo
  Jun 2010