אימונים Effects of Whole Body Vibration Training on Different Devices on Bone Mineral Density

[Mike Bikov]

Med Sci Sports Exerc. 2010 Oct 26. [Epub ahead of print]
Effects of Whole Body Vibration Training on Different Devices on Bone Mineral Density.

Stengel SV, Kemmler W, Bebenek M, Engelke K, Kalender WA.

Institute of Medical Physics University of Erlangen-Nueremberg, Germany.
Abstract

PURPOSE: Whole body vibration (WBV) is a new non-pharmacological approach to counteract osteoporosis. However, the specific vibration protocol to most effectively reduce osteoporotic risk has not been reported. In the ELVIS II (Erlangen Longitudinal Vibration Study II) trial we determined the effect of different WBV devices on bone mineral density (BMD) and neuromuscular performance.

METHODS: 108 postmenopausal women (65.8 ± 3.5 y) were randomly allocated to: (1) rotational vibration training (RVT); 12.5 Hz, 12 mm, 3 sessions/week, á 15 min, including dynamic squat exercises; (2) vertically vibration training (VVT); 35 Hz, 1.7 mm, a.a.; (3) wellness control group (CG): two blocks of 10 low intensity gymnastics sessions. BMD was measured at the hip and lumbar spine at baseline and after 12 months of training using Dual-Energy-X-Ray absorptiomety (DXA). Maximum isometric leg extension strength and leg power were determined using force plates.

RESULTS: A BMD gain at the lumbar spine was observed in both vibration VT groups (RVT: +0.7 ± 2.2%; VVT: +0.5 ± 2.0%) which was significant compared to CG value (-0.4 ± 2.0%) for RVT (p = 0.04) and borderline non-significant for VVT (P = 0.08). In the neck region no significant treatment effect occurred. Neck BMD values tended to increase in both VT groups (RVT +0.3 ± 2.7%; VVT: +1.1 ± 3.4%) and remained stable in CG (-0.0 ± 2.1%).Both VT groups gained maximum leg strength (RVT: +27 ± 22%; VVT: +24 ± 34%) compared to CG (+6 ± 20%; p = 0.000), whereas power measurements did not reach the level of significance (P = 0.1).

CONCLUSIONS: WBV training is effective for reducing the risk for osteoporosis by increasing lumbar BMD and leg strength.

PMID: 20980923 [PubMed - as supplied by publisher

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