Table 4
Low back and trapezius muscle activity (EMG) of urban bus drivers during driving vs. break (% of MVC, n = 40)
Driving Break
Low back Left
No support 0.9 ± 0.9 2.2 ± 1.4‡
Support 0.9 ± 1.0 2.5 ± 1.6‡
Right
No support 1.0 ± 0.9 2.3 ± 1.4‡
Support 1.0 ± 0.9 2.3 ± 1.2‡
Trapezius Left
No support 3.6 ± 2.3 5.2 ± 3.1‡
Support 3.8 ± 1.9 4.8 ± 2.3‡
Right
No support 2.6 ± 1.7 4.5 ± 2.2‡
Support 3.0 ± 1.6 4.6 ± 2.1‡
Values are expressed as mean ± S.D.
‡ P < 0.001.