Table 2
Low back muscle activity of healthy drivers and those having low back trouble (rms EMG) with and without low back support (percent of MVC) during urban bus driving
Healthy (n = 15) Low back trouble (n = 25) Left
No support 1.1 ± 0.8 0.9 ± 0.6
Support 1.3 ± 1.1 0.9 ± 0.7
Right
Values are expressed as mean ± S.D. Table 3
Trapezius muscle activity of (rms EMG) with and without low back support (percent of MVC) during urban bus driving
Healthy Low back trouble Left
No support 4.8 ± 3.3 3.1 ± 1.8*
Support 4.2 ± 2.6 3.4 ± 1.8
Right
No support 3.3 ± 2.0 2.3 ± 1.5
Support 3.5 ± 2.0 2.5 ± 1.4
Values are expressed as mean ± S.D.
* P < 0.05.