Cross-training Effect of Whole-body Vibration

This study was included 40 healthy volunteers. The change in the quadriceps muscle strength after 20 session of WBV exercises was evaluated this study. In the WBV group, 20 sessions of unilateral lower extremity vibration exercises were performed with the Whole Body Vibration (WBV) device. WBV was applied when the subjects are in the semi-squat position. WBV was implemented with Powerplate® Pro5 (PowerPlate® International Ltd, London, United Kingdom). During 20 sessions, the WBV amplitude and vibration time were increased gradually. In the first session, the subjects were do a 30-second, 30-35, 40- and 45-Hz low-amplitude WBV while the knee and hip joint were in 30 degrees of flexion (in the semi-squat position); 10-second rest period between vibration applications were applied. A total duration of WBV was be two minutes. In the 20th session, the subjects were given a 60-second, 30-, 35-, 40- and 45-Hz high-amplitude WBV while the knee and hip joint were in 45 degrees of flexion; 10-second rest period between vibration applications were applied. A total duration of WBV was eight minutes. During WBV, the left lower extremity was in the knee-hip flexion position but was not exposed the vibration.

The same experimental protocol was applied to the isometric exercise (control) group. Unlike the experimental group, sham vibration was applied to the control group. Before and after 20 session-exercise, both knee extensor isokinetic muscle strength was measured.

Inclusion criteria

• Men with ages between 20-50 years
• Being healthy
• Being volunteer
• Right-sided dominant

Exclusion criteria

• Non-cooperative subject