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Effects of arm suspension in simulated assembly line work: muscular activity and posture angles
Y Feng1, W Grooten, P Wretenberg
1Karolinska Institute, Department of Neuroscience (Anatomy), Stockholm, Sweden.
Applied Ergonomics
|May 18, 1999
Abstract:
The electromyogram and posture angles of the shoulder and arm were recorded during sitting manipulative work in three positions, with and without the forearm suspended by a balancer. A Selspot system was used to record movements. The results from 12 female subjects (mean age 29 yr) showed that the activity in deltoideus anterior decreased significantly by using a balancer. Lower mean values were also noted for deltoideus lateralis and the trapezius muscles. The neck inclination increased with higher work area position, but was independent of the use of a balancer.