Characteristic of Muscular Load in Computer Data Entry Workers Assessed by EMG and Postural Angles

The goal of this study was to characterize the muscular load in computer data entry workers. EMG parameters of trapezius muscle and postural angles of head, arm, and back were chosen as indicators of musculoskeletal load. The examination was done according to the methods and protocol of international MEPS studies (the "Musculoskeletal, Visual, and Psychosocial Load in VDT Operators in Optimized Environment" international program). The musculoskeletal load during routine VDT data entry work performed by a group of 36 women was assessed on the basis of one-hour physiometer recordings. Results show that the musculoskeletal load associated with data entry is relatively high comparing to other VDT operators' tasks described in the literature. An analysis of the measured parameters shows that most of the time women worked with muscular load higher than optimal. It is postulated that the main reason for the heavy musculoskeletal load was improper posture compelled by unergonomic spatial configuration of work stands.