WBV at 90 or 30 Hz well tolerated; doesn't improve bone density, structure in postmenopause
WEDNESDAY, Nov. 16 (HealthDay News) -- Low magnitude whole-body vibration (WBV) does not affect bone mineral density (BMD) and structure in healthy postmenopausal women who receive calcium and vitamin D supplementation, according to a study published in the Nov. 15 issue of the Annals of Internal Medicine.
Lubomira Slatkovska, Ph.D., from the Mount Sinai Hospital in Toronto, and colleagues investigated whether bone density and structure improved with WBV in 202 healthy postmenopausal women not receiving prescription bone medications, with BMD T-scores between −1.0 and −2.5. Participants all received calcium and vitamin D and were randomly assigned to three groups: stand for 20 minutes daily on a low-magnitude (0.3g) 90-Hz platform or 30-Hz platform, or controls. Trabecular volumetric BMD, other measurements of the distal tibia and distal radius, and areal BMD were assessed at baseline and 12 months.
The investigators found that, compared to women who did not receive WBV, 12 months of WBV therapy had no significant effect on bone outcomes. The mean change in tibial trabecular volumetric BMD from baseline was 0.4, −0.1, and −0.2 mg/cm³ in the 90 Hz WBV, 30 Hz WBV, and control groups, respectively (P = 0.55). All groups showed similar changes in the areal BMD at the femoral neck, total hip, and lumbar spine. Low-magnitude WBV was well tolerated at both 90 and 30 Hz.
"Whole-body vibration therapy at 0.3g and 90 or 30 Hz for 12 months did not alter BMD or bone structure in postmenopausal women who received calcium and vitamin D supplementation," the authors write.
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