title: Electromyographic analysis of an ergonomic risk factor: overhead work.
abstract: [Purpose] Repetitive upper extremity exercises result in overuse injuries. However, it is challenging to identify the specific causative movements. This study evaluated the effects of different shoulder positions on grip and electrophysiological activity of upper extremity muscles. [Subjects and Methods] Forty subjects ranging from 18 and 30 years of age were analyzed. Surface electromyography and hand grip strength were measured during a range of shoulder exercises and numerous signal processing methods were applied. [Results] The maximum electromyographic activity intensity was observed in the wrist extensors at various angles. Deltoid activity rose significantly during shoulder flexion. [Conclusion] Overhead work causes shoulder muscle fatigue and prevents effective hand function, which affects occupational health and efficiency. Overhead work involves a hazardous position and decreases efficiency. Ergonomic solutions should be developed to prevent muscle fatigue and decreased grip force.
authors.affiliation: Physiotherapy and Rehabilitation Department, İstanbul Gelişim University College of Health, Turkey.
authors.forename: Gulsah
authors.initials: G
authors.lastname: Kinali
authors.affiliation: Institute of Biomedical Engineering, Fatih University, Turkey.
authors.forename: Sadık
authors.initials: S
authors.lastname: Kara
authors.affiliation: Institute of Biomedical Engineering, Fatih University, Turkey.
authors.forename: Mustafa Selman
authors.initials: MS
authors.lastname: Yıldırım
keywords: Electromyography; Ergonomics; Work-related musculoskeletal disorders