Table 3. Exercise protocol of the WBV group

Time	Exercise
Week 2 - 4	Isometric standing position on the WBV-platform with a vibration frequency of 10 to 15Hz for one minute and with an increasing amount of repetitions (2 up to 6 series).
Weeks 5 - 7	Isometric exercise described above remained, but vibration frequency and hence exercise intensity increased progressively every day in steps of 5 Hz dependent on the patient’s individual shape up to 30Hz. Five series of 1.5 to 2 min.
Weeks 8-11, standing-up	Transition to dynamic exercise in the form of squats. Additional load (10% of maximum muscle strength) was applied depending on the individual shape. Five to seven series of 2 minutes.