It is known that the change of toroidal rotation velocity in JET H-mode shots strongly changes the stiffness of the ion temperature profile, but weakly influences a global confinement. The quantitative estimates of these effects are found for several selected H-mode discharges with various heat mix of combined NBI and ICRH heating. With the change of rotation velocity by factor 3, the energy confinement time changes approximately by 10%, but the stiffness of the ion temperature profile changes in the gradient zone approximately by 3 times.