To our knowledge, there is no previous field study on low back and neck–shoulder muscle loading in urban bus drivers. Subjects of this study represented average Finnish bus drivers, and only seven out of 40 drivers had never experienced back pain. This study showed that average paraspinal muscle loading in urban bus drivers during driving itself was minimal. Even average muscle activity during breaks was significantly higher. Low back pain and ergonomic lumbar support had no effect on paraspinal muscle activity. Trapezius muscle activity tended to be higher in drivers with LBP. Increased muscle activity was expected in drivers suffering low back pain due to protective muscle spasm or decreased due to reflex- inhibition or adaptation [35] but this was not seen during driving.