Podokinetic After-Rotation Is Transiently Enhanced or Reversed by Unilateral Axial Muscle Proprioceptive Stimulation

Figure 5

Step yaw angle. (a) Mean step yaw angle calculated for the right foot during the last minute of the PKS and during the PKAR (without and with vibration at different time intervals—the same intervals considered for the calculation of the angular velocity). Green bars refer to reference PKAR, blue bars refer to PKAR with right-side vibration, and red bars refer to PKAR with left-side vibration. Striped bars refer to the vibration periods. There is a significant difference in the foot yaw angle between reference PKAR and PKAR with vibration in both periods in which vibration was present. (b, c) Relationships between mean foot angle and body rotation velocity during the first (b) and second (c) periods of vibration. Each dot corresponds to a subject. Green dots refer to PKAR without vibration, blue dots refer to PKAR with right-side vibration, and red dots refer to PKAR with left-side vibration. There is a good relationship between yaw foot angle and body rotation velocity ( for all the regression lines across conditions and vibration periods).

(a)

(b)

(c)