Force and Muscular Activity During Pulling Activity with and without Using a Cart
Força E Atividade Muscular Durante A Atividade De Tração Com E Sem O Uso De Um Carrinho
Nívia Cecília Kruta de Araújo, Catarina de Oliveira Sousa, Tatiana de Oliveira Sato
Abstract
Recyclable material collectors perform manual material handling activities using nylon bags. In cooperatives, these bags are dragged on the floor; however, this activity has been replaced by carts to facilitate activity, improve logistics, increase the useful life of bags and reduce musculoskeletal complaints. However, there is no evidence that the use of carts can bring benefits to this activity. Thus, we compared the traction force and the muscular activity of the upper limb during manual handling with and without the aid of a cart. Fifteen workers pulled bags with plastic (20 kg), cardboard (30 kg) and aluminum (40 kg), with and without the use of a cart. The traction force was greater when the bag was handled manually and increased according to the bag's mass; no differences were found between the masses with the use of the cart. Muscle activity was greater for the cart and with a tendency to increase activation as the mass increases. Thus, we noticed that the use of the cart reduced the traction force and increased the activation of the muscles of the upper limbs.
Keywords
Resumo
Coletores de materiais recicláveis realizam atividades manuais de manuseio de materiais usando sacolas de nylon. Em cooperativas, essas sacolas são arrastadas no chão; no entanto, essa atividade foi substituída por carrinhos para facilitar a atividade, melhorar a logística, aumentar a vida útil das sacolas e reduzir queixas musculoesqueléticas. No entanto, não há evidências de que o uso de carrinhos possa trazer benefícios a essa atividade. Assim, comparamos a força de tração e a atividade muscular do membro superior durante o manuseio manual com e sem o auxílio de um carrinho. Quinze trabalhadores puxaram sacolas com plástico (20 kg), papelão (30 kg) e alumínio (40 kg), com e sem o uso de um carrinho. A força de tração foi maior quando a sacola foi manipulada manualmente e aumentou de acordo com a massa da sacola; não foram encontradas diferenças entre as massas com o uso do carrinho. A atividade muscular foi maior para o carrinho e com uma tendência a aumentar a ativação à medida que a massa aumenta. Assim, observamos que o uso do carrinho reduziu a força de tração e aumentou a ativação dos músculos dos membros superiores.
DOI da Versão Traduzida: https://doi.org/10.4322/rae.v15e202106.en
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