Effects of arm suspension in simulated assembly line work: muscular activity and posture angles

Appl Ergon. 1999 Jun;30(3):247-53. doi: 10.1016/s0003-6870(98)00023-4.

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.

Publication types

  • Clinical Trial
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Analysis of Variance
  • Biomechanical Phenomena
  • Electromyography
  • Ergonomics*
  • Female
  • Humans
  • Muscle, Skeletal / physiology*
  • Neck Pain / physiopathology
  • Neck Pain / prevention & control*
  • Posture / physiology*
  • Shoulder*