Centre of pressure parameters for the assessment of biomechanical risk in fatiguing frequency-dependent lifting activities.

In HC, the regression line, ( Fig 5 ) estimated for each level of risk, showed an increasing trend for all velocity parameters at LI = 2 and LI = 3, and leading to a significant difference between the start and the end of the tasks ( Table 2 ); in contrast, in LBP the MV ML increased significantly for all three levels of risk. 3.2 sEMG parameters Fig 6 presents the RMS and MNF mean values and the regression lines for each risk level in both groups. 3.3 Correlation between CoP and sEMG parameters The correlation between sEMG parameters (RMS and MNF) and velocity CoP parameters (MV, MV ML and MV AP ) are reported in Table 3 .

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