Twenty-six subjects in the vibration group and 26 controls
completed the study without side effects or adverse
reactions. Two participants in the control group withdrew
from the study because of loss of interest, and two participants
in the vibration group withdrew because of musculoskeletal
problems that were independent from the vibrationloading
(the first one for rib fracture; the second one for an
orthopedic operation). The basic characteristics of the 52
subjects are given in Table 1.
The reported mean vibration-training frequency was 3.1
(0.9) times per week. Because there were no gender differences
in the time-effect at the 2-month and 4-month tests,
the data of women and men were pooled and analyzed
together.