Título:	Comparison of the electrical activity in upper trapezius and wrist extensor muscles during two typewriting conditions Comparação da atividade elétrica dos músculos trapézio superior e extensores do punho em duas condições de digitação
Autor(es):	Comel, João Carlos Batista Junior, João Pedro Chini, Eliana Paula Pereira, Hugo Maxwell Carregaro, Rodrigo Luiz Cardoso, Jefferson Rosa
Assunto:	Eletromiografia Ergonomia Ambiente de trabalho
Data de publicação:	2014
Editora:	Pontifícia Universidade Católica do Paraná
Referência:	COMEL, João Carlos et al. Comparison of the electrical activity in upper trapezius and wrist extensor muscles during two typewriting conditions. Fisioterapia em movimento, Curitiba, v. 27, n. 2, p. 271-279, jun. 2014. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-51502014000200271&lng=en&nrm=iso>. Acesso em: 06 out. 2018. doi: http://dx.doi.org/10.1590/0103-5150.027.002.AO12.
Abstract:	Introduction The proper use of the position of the arm and wrist while typing may reduce muscle overload and prevent musculoskeletal disorders.Objective To evaluate the electromyographic activity of upper trapezius and wrist extensor muscles during two typewriting conditions.Materials and methods : Six healthy females (Xage = 42 years,SD= 10), (Xheight = 1.65m, SD = 0.05) and (Xweight = 71kg, SD = 16) participated in this study. The task was performed with a newly developed arm support and without the support. A perceived exertion scale was used with all subjects. An ANOVA with repeated measures was used to verify differences in perceived exertion and root mean square (RMS).Results There were no statistically significant differences for the RMS between the typewriting tasks. The condition without arm support presented a significantly greater mean velocity and amount of words typed (P= 0.02; P= 0.03) and there was a significant difference in perceived exertion during the condition without arm support (P= 0.03). Electromyographic activity did not present differences.Conclusion The muscle electrical activity was not altered regardless the arm support and occurred the improvement of the perceived exertion after 10 minutes of typing without support. Long-term studies are needed.
Licença:	Licenciado sob uma Licença Creative Commons (CC BY).
DOI:	http://dx.doi.org/10.1590/0103-5150.027.002.AO12
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