Forças manuais e o design de produtos: uma revisão

• Autor(a) principal: Razza, Bruno Montanari
• Data de Publicação: 2010
• Outros Autores: Paschoarelli, Luis Carlos [UNESP], Lucio, Cristina do Carmo
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://periodicos.uem.br/ojs/index.php/RevTecnol/article/view/8371; http://hdl.handle.net/11449/134501
• topic: Design; Ergonomics; Biomechanics; Hand strength; Grip; Design; Ergonomia; Biomecânica; Forças manuais; Preensão

Object manipulation is common in most daily living activities and many products and tasks require the application of large hand strength. The great incidence of injuries and accidents related to manual activity is a result of the lack of reliable and consistent parameters to design more efficient products. The aim of this paper was to review studies related to hand strength and indicate the characteristics and variables that have influence on the occupational tasks and everyday activities. Among those characteristics, we highlight the body posture and the positioning of various body segments as factors that may reduce the force, such as wrist deviation or inadequate postures. The type of grip was also widely investigated, resulting that handgrip can exert more force than pinch grips. In rotary strength evaluations, the flexion and extension movements of the wrist are generally stronger than pronation-supination. In general, cylindrical objects or those which have smooth surface finish are less effective in activities where greater strength is required. These considerations highlight the importance of knowing the variables related to manual activities, and indicate the need to investigate further the hand-object interface in both occupational and everyday activities.