At the baseline workshop, recordings will be presented showing work tasks with excessive physical load customized for each gang.
The EMG activity will be calculated and used to define the cut points for excessive physical load.
The sequences with excessive physical load will be calculated based on laboratory recordings investigating EMG activity in standardized lifting situations.
During the workshop the video recordings of the work tasks with excessive physical load will be shown to the gang and their managers.
The primary outcome of the present study is the change from baseline to follow-up in frequency of events with excessive physical load.
Based on these measurements we will develop a load matrix for each worker in the study that will be the basis for the detection of which working tasks evoke excessive physical load.
The objectives of this study are to; 1) determine which work-tasks in selected job-groups involve excessive physical load of the back and shoulders during a normal working day (measured with accelerometers, EMG and video recordings).
The method is considered cost efficient since the researcher will not have to view 7-8 h of video manually, but only the sequences with measurements of excessive physical load (see below).
