Low-frequency vibratory exercise reduces the risk of bone fracture more than walking: a randomized controlled trial

BMC Musculoskelet Disord. 2006 Nov 30;7:92. doi: 10.1186/1471-2474-7-92.

Abstract

Background: Whole-body vibration (WBV) is a new type of exercise that has been increasingly tested for the ability to prevent bone fractures and osteoporosis in frail people. There are two currently marketed vibrating plates: a) the whole plate oscillates up and down; b) reciprocating vertical displacements on the left and right side of a fulcrum, increasing the lateral accelerations. A few studies have shown recently the effectiveness of the up-and-down plate for increasing Bone Mineral Density (BMD) and balance; but the effectiveness of the reciprocating plate technique remains mainly unknown. The aim was to compare the effects of WBV using a reciprocating platform at frequencies lower than 20 Hz and a walking-based exercise programme on BMD and balance in post-menopausal women.

Methods: Twenty-eight physically untrained post-menopausal women were assigned at random to a WBV group or a Walking group. Both experimental programmes consisted of 3 sessions per week for 8 months. Each vibratory session included 6 bouts of 1 min (12.6 Hz in frequency and 3 cm in amplitude with 60 degrees of knee flexion) with 1 min rest between bouts. Each walking session was 55 minutes of walking and 5 minutes of stretching. Hip and lumbar BMD (g.cm-2) were measured using dual-energy X-ray absorptiometry and balance was assessed by the blind flamingo test. ANOVA for repeated measurements was adjusted by baseline data, weight and age.

Results: After 8 months, BMD at the femoral neck in the WBV group was increased by 4.3% (P = 0.011) compared to the Walking group. In contrast, the BMD at the lumbar spine was unaltered in both groups. Balance was improved in the WBV group (29%) but not in the Walking group.

Conclusion: The 8-month course of vibratory exercise using a reciprocating plate is feasible and is more effective than walking to improve two major determinants of bone fractures: hip BMD and balance.

Publication types

  • Comparative Study
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Age Factors
  • Aged
  • Bone Density / physiology
  • Exercise Therapy / methods*
  • Female
  • Femur / physiology
  • Fractures, Bone / etiology
  • Fractures, Bone / prevention & control*
  • Fractures, Bone / therapy
  • Humans
  • Middle Aged
  • Osteoporosis, Postmenopausal / complications
  • Osteoporosis, Postmenopausal / prevention & control*
  • Osteoporosis, Postmenopausal / therapy
  • Physical Fitness / physiology*
  • Postural Balance / physiology
  • Sex Factors
  • Treatment Outcome
  • Vibration / therapeutic use*
  • Walking / physiology*