Figure 4

Pain reactions to stimulation with the rollers. Pain ratings during dynamic pressure algometry. Two graphs in the upper and the lower panels show the maximal pain intensity on the visual analogue scale (VAS) and area under VAS curve (AUC) induced by the roller with low pressure level and high pressure level, respectively. The roller with high pressure level corresponds to the pressure pain threshold (PPT); the roller with low pressure level corresponds to the pressure level just below PPT level (See methods section for further details). For both rollers, there was neither significant difference in maximal pain intensity nor in the AUC between groups. Pressure levels of the two rollers (mid-point on the x-axis in each column) were not significantly different between groups.