Abstract
Acute effects on drivers from different twisted postures and whole-body vibrations were studied. Effect variables were subjective discomfort and EMG-activity. The study was performed with experienced drivers on test tracks in the field. Two types of industrial trucks and an agricultural tractor were used. The machines gave different types of vibrations. Ratings of discomfort with Borg's CR-10 scale and EMG-activity correlated well with both the degree of twist of the posture and the vibration level. The discomfort was exclusively localised to the lumbar and the neck-shoulder regions. It was foremost expressed as a feeling of tension and common discomfort. Rotation of the neck, 30–50 degrees, gave big effects on both discomfort and EMG-level. No clear differences between the effects of the vibration exposures from the different vehicles were found.
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