Arm and shoulder muscle load in various keyboard operating jobs.

Muscle activity and fatigue in the shoulder muscles of assembly-plant employees.

“…The present values for static contraction levels in employees at an assembly plant are similar to those contained in other reports (6,11,16). ed in the recording time were converted to the percentage of the MVC from the calibration curve .…”

The Ergonomics Society The Society's Lecture 1986 SITTING POSTURE: AN OLD PROBLEM AND A NEW ONE

“…A number of authors (Nachemson 1965, Avon and Schmitt 1975, Andersson 1980, Andersson et al 1980, Jonsson 1982, Onishi et al 1982 have addressed their attention to assessing the muscular activity involved in different jobs done in a sitting position: a series of data have resulted concerning the degree of muscular activity in the various sitting postures, on the occurrence of localized muscular fatigue according to tbe task and on the importance of minimizing static muscular activity.…”

Survey of Faulty Postures and Associated Factors Among Chinese Adolescents

“…Poor posture has been reported as the most important contributing factor of shoulder and neck pain. [9][10][11][12][13] Larsson et al 14 also found that poor posture was the most important contributing factor of low back pain for industrial workers. Christie et al 15 reported that there was a significant difference in the lumbar lordotic angle between those people with chronic low back pain and controls.…”