![]() Based on self-assessment data, subjects with no history of chronic LBP with half-width of greater than 56 Hz were at threefold greater risk of developing back pain compared with the remainder of the population ( p = 0.045). The value of the EMG variable half-width at inception demonstrated significant association with changes in subject’s outcome measure and their own assessment of their LBP at follow up ( p < 0.05). 16 out of 93 subjects with no history of chronic low-back pain became worse as measured by time off work, disability, reported pain and self-assessment rating. 108 (90%) subjects were reviewed at a minimum 2-year follow up. The EMG recordings were performed under isometric trunk extension at 2/3 maximum voluntary contraction and acquired from erector spinae muscles at the level of L4/L5. 120 health care workers underwent paraspinal EMG measurements and assessment of back pain disability. This 2-year prospective study investigates the association of LBP with EMG variables over time. Studies of EMG power spectra have established associations between low-back pain (LBP) and median frequency (MF). ![]()
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