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Musculoskeletal Workload during Non-Linear Video Editing

Today, video editing in TV production is mainly performed using digital computer systems. The aim was to evaluate the musculoskeletal workload among the technicians performing digital (non-linear) video editing. Six technicians volunteered in the study and they performed non-linear video editing during a normal day. As a reference they performed a multidirectional computer mouse task. Muscle activity (EMG) was recorded from the forearm muscles (m. extensor carpi radialis, m. extensor digitorum and the forearm flexors) and from the shoulder/neck region (right and left m. trapezius, neck muscles (right side)). Perceived exertion was rated according to a CR-10 scale. The perceived exertion located to hand/wrist, forearm/elbow and shoulder and neck increased during the working day. Very few or none EMG gaps were found for the forearm extensor muscles during work. A static loading of the neck and the forearm extensor muscles was found during non-linear video editing despite the low number of input device operations per time (mouse clicks and keystrokes) and a well adjusted work place where the forearms were supported most of the working time. This may be related to high demands on precision in time and constrained working postures with the hands alert on keyboard and mouse and the eyes focused on monitors for the major part of the working time. Finally, eye blink frequency was found to be very low during non-linear video editing.