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Mean ± Standard Deviation for the velocity outcomes during serve test before (T0), after regular training (TRT) and after Motor Imagery training (TMI). (A) The serve velocity of successful serves, (B) the coefficient of variation (CV) of the serve velocity, with * for p ≤ 0.05, ** for p ≤ 0.01 and *** for ≤ 0.001.
