Both paraspinal and trapezius myoelectric activity was higher during breaks than during driving (Table 4).
Low back and neck–shoulder fatigue increased significantly during driving in both groups (Tables 5 and 6). The neck–shoulder pain and fatigue were more severe in drivers suffering from low back trouble. Ergonomic low back sup- port had no effect on low back and neck–shoulder fatigue and neck–shoulder pain. According to multiple-choice questionnaire 26 (65%) of all subjects, 9 (56%) from back pain group and 17 (71%) from back healthy drivers subjectively benefited for ergonomic low back support.