Avaliação da Assimetria dos Membros Superiores Durante a Atividade de Digitação em Computadores Desktop e Notebook
Assessment Of Upper Limb Asymmetry During Computer Typing Activity On Desktops And Notebooks
Josiane Sotrate Gonçalves, Cristiane Shinohara Moriguchi, Karina Satiko Takekawa, Tatiana de Oliveira Sato
Resumo
Este estudo teve como objetivo comparar os lados direito e esquerdo em relação aos movimentos dos membros superiores, atividade muscular e descarga de peso sobre a mesa durante uma atividade simulada de digitação em computadores do tipo desktop e notebook. Quinze estudantes universitárias foram avaliadas durante uma atividade simulada de digitação com duração de cinco minutos nos dois tipos de computador, em ordem aleatorizada. A atividade muscular dos músculos trapézio superior e deltóide anterior foram registrados bilateralmente por meio de eletromiografia. Os movimentos do ombro foram avaliados por meio de inclinômetros e os movimentos do punho e cotovelo foram medidos através da eletrogoniômetros. A descarga de peso do antebraço foi avaliada por células de carga colocadas sob a superfície da mesa. Não houve diferença entre os diferentes tipos de computadores durante a atividade de digitação, porém houve maior sobrecarga musculoesquelética no membro superior direito. Portanto, medidas preventivas e estratégias ergonômicas visando reduzir a assimetria durante o uso de computadores são necessárias
Palavras-chave
Abstract
This study aimed to compare the right and left sides in relation to the movements of the upper limbs, muscle activity and weight bearing on the table during a simulated activity of typing on the computer desktop and notebook. Fifteen university students were evaluated during five minutes of simulated typing activity in both types of computers. The evaluation order was randomized. Upper trapezius and anterior deltoid activation were recorded bilaterally by surface electromyography. Shoulder movements were assessed by inclinometers, wrist and elbow movements were measured using electrogoniometers. Forearm weight discharge was evaluated by load cells placed under the table surface. There was no difference between the different types of computers during the activity of typing, but musculoskeletal load was higher in the right upper limb. Therefore, preventive measures and ergonomic strategies to reduce the asymmetry between limbs in the use of computers are required.
Translated version DOI: https://doi.org/10.4322/rae.v15e202110.en
Keywords
Referências
Baker NA, Cidboy EL. The effect of three alternative keyboard designs on forearm pronation, wrist extension, and ulnar deviation: a meta-analysis. Am J Occup Ther. 2006;60(1):40-49.
Bergqvist U, Wolgast E, Nilsson B, Voss M. Musculoskeletal disorders among visual display terminal workers: individual, ergonomic and work organisational factors. Ergonomics. 1995;38(4):763-776.
Berkhout AL, Hendriksson-Larsen K, Bongers P. The effect of using a laptop station compared to using a standard laptop PC on the cervical spine torque, perceived strain and productivity. Appl Ergon. 2004,35:147-152.
Cook C, Burgess-LImerick R, Papalia S. The effect of upper extremity support on upper extremity posture and muscle activity during keyboard use. Appl Ergon. 2004a;35:285-392.
Gold JE, Driban JB, Yingling VR, Komaroff E. Characterization of posture and comfort in laptop users in non-desk settings. Appl Ergon. 2012;43:392-399.
Hansson GA, Balogh I, Byström JU, Ohlsson K, Nordander C, Asterland P, Sjölander S, Rylander L, Winkel J, Skerfving S. Questionnaire versus direct technical measurements in assessing postures and movements of the head, upper back, arms and hands. Scand J Work Environ Health. 2001;27(1):30-40.
Hansson GA, Balogh I, Ohlsson K, Granqvist L, Nordander C, Arvidsson I, Åkesson I, Unge J, Rittner R, Strömberg U, Skerfving S. Physical workload in various types of work: Part I. Wrist and forearm. Int J Ind Ergon. 2009;39(1):221-233.
Jacobs K, Johnson P, Dennerlein J, Peterson D, Kaufman J, Gold J, Williams S, Richmond N, Karban S, Firn E, Ansong E, Hudak S, Tung K, Hall V, Pencina K, Pencina M. University students’ notebook computer use. Appl Ergon. 2009;40:404-409.
Mathiassen SE, Winkel J, Hagg G. Normalization of surface EMG amplitude from the upper trapezius muscle in ergonomic studies - a review. J Electromyogr Kinesiol. 1995;5:197-226.
McLoone H.E, Jacobson M, Clark P, Opina R, Hegg C, Johnson P. Design and evaluation of a curved computer keyboard. Ergonomics. 2009;52(12):1529-1539.
Moriguchi CS, Carnaz L, Alencar JF, Miranda Junior LC, Granqvist L, Hansson GA, Gil Coury HJC. Postures and movements in the most common tasks of power line workers. Ind Health. 2011;49(4):482-491.
Nag PK, Pal S, Nag A, Vyas H. Influence of arm and wrist support on forearm and back muscle activity in computer keyboard operation. Appl Ergon. 2009;40:286-291.
Noack-Coopera KL, Sommerich CM, Mirka GA. College students and computers: assessment of usage patterns and musculoskeletal discomfort. Work. 2009;32:285-298.
Rempel D, Barr A, Brafman D, Young E. The effects of six keyboard designs on wrist and forearm postures. Appl Ergon. 2007;38(3):293-298.
Rempel D. The split keyboard: an ergonomics success story. Hum Factors. 2008; 50(3):385-392.
Saito S, Miyao M, Kondo T, Sakakibara H, Toyoshima H. Ergonomic evaluation VDT operation using flat panel display. Ind Health. 1997;35:264-270.
Schlossberg EB, Morrow S, Llosa AE, Mamary E, Dietrich P, Rempel DM. Upper extremity pain and computer use among engineering graduate students. Am J Ind Med. 2004,46:297-303.
SENIAM (Surface ElectroMyoGraphy for the Non-Invasive Assessment of Muscles) disponível em: http://www.seniam.org/. Acesso em: 05/06/2013.
Szeto GP, Lee R. An ergonomic evaluation comparing desktop, notebook, and subnotebook computers. Arch Phys Med Rehabil. 2002;83(4):527-532.
