A comparative analysis of neck muscle tension in a harvester operator compared with chainsaw and horse skidding operator and with normal human activities

The goal of the experiment was to assess the physical stress experienced by an operator during the use of harvester equipment. Experimental data was obtained from field measurements with a Biofeedback 2000x-pert (BFB) unit, which allows recording of selected physiological parameters on the operator, especially an electromyogram of target muscle groups, body temperature, breathing rate and pulse. Experimental data was interpreted by comparing it with values measured during normal human activities. Measurements were done during logging using a harvester, a chainsaw, while skidding with a horse, while running, and while walking normally. The results of the experiment showed that the electromyograph (EMG) of the investigated muscle groups exhibited values 164% higher during running than during the cut-to-length (CTL) production, up to 77% higher while walking, up to 28% higher during logging with a chainsaw, and even up to 230% higher values while skidding with a horse. Body temperature and pulse measurements did not show a significant difference in values measured during CTL production and during other activities.