title: Effects of arm suspension in simulated assembly line work: muscular activity and posture angles.
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.
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001696:Biomechanical Phenomena; D004576:Electromyography; D006804:Ergonomics; D005260:Female; D006801:Humans; D018482:Muscle, Skeletal / Q000502:physiology*; D019547:Neck Pain / Q000503:physiopathology / Q000517:prevention & control*; D011187:Posture / Q000502:physiology*; D012782:Shoulder