Figure 1. Mean and SD RMSemg values of (A) – vastus lateralis; (B) – vastus medialis for trails without vibration (T1 and T2) and combinations of frequencies and amplitudes: 2 mm/20 Hz (T3), 2 mm/40 Hz (T4), 2 mm/60 Hz (T5), 4 mm/20 Hz (T6), 4 mm/40 Hz (T7), 4 mm/60 Hz (T8). * indicate statistically significant differences between 2 mm and 4 mm amplitude of vibration at the same frequency (p < 0.05), horizontal bars with vertical dashes indicate statistically significant differences between frequencies at the same amplitude of vibration (p < 0.05), horizontal bars with circles indicate statistically significant differences between T1 and T2 (no vibration) and all trials with vibration (T3-T8) (p < 0.05)