How is a box handled when all surfaces can be freely held?

Autor(es)

Oliveira, A. B. ^[1] ; Silva, L. C. C. B. ^[1] ; Palinkas, E. S. L. ^[1] ; Padula, R. S. ^{[2, 3]} ; Coury, H. J. C. G. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos UFSCar, Dept Phys Therapy, Sao Carlos, SP - Brazil

^[2] Univ Cidade Sao Paulo UNICID, Masters Phys Therapy Program, Sao Paulo - Brazil

^[3] Univ Sao Francisco, Dept Physiotherapy, BR-12900000 Braganca Paulista, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ERGONOMICS; v. 55, n. 1, p. 78-86, 2012.
• Citações Web of Science: 1

Resumo

In this study, we investigated how experienced and inexperienced subjects handle a box when it could be approached from any of its sides. Subjects moved a box (11 kg) either to a high (HS) or a low surface (LS). Wrist movements and grip force were synchronised and recorded, respectively, by electrogoniometers and an instrumented box. All subjects adopted a lateral-and-bottom grip, with parts of the hands simultaneously placed on the side and bottom of the box. This grip allowed the 50th percentile of wrist movements to be within safe limits, particularly in the sagittal plane. Low force was associated with lowering the box to LS and equally distributed but greater force when lifting to HS. Larger ulnar deviation was recorded when the box was lifted to HS. Only peak of wrist extension differentiated experienced from inexperienced subjects, with experienced presenting larger wrist extension. Alternative box designs are suggested to improve handling in real settings. Practitioner Summary Understanding worker preferences for box lifting behaviour can contribute to the development of new designs that facilitate the adoption of more efficient postures while reducing the risk of upper-limb musculoskeletal disorders and promoting safer manual material handling. (AU)

• Processo FAPESP: 05/53804-3 - Avaliação do padrão de movimentos do membro superior durante o manuseio de cargas em trabalhadores e indivíduos inexperientes
• Beneficiário: Ana Beatriz de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 08/10372-4 - Avaliação de movimentos da região cervical e ombros em eletricistas durante atividade ocupacional
• Beneficiário: Helenice Jane Cote Gil Coury
• Modalidade de apoio: Auxílio à Pesquisa - Regular