title: High-frequency vibration training increases muscle power in postmenopausal women.
abstract: OBJECTIVE
  To test whether training on a high-frequency (28Hz) vibrating platform improves muscle power and bone characteristics in postmenopausal women.
  
  
  METHODS
  Randomized controlled trial with 6-month follow-up.
  
  
  METHODS
  Outpatient clinic in a general hospital in Italy.
  
  
  METHODS
  Twenty-nine postmenopausal women (intervention group, n=14; matched controls, n=15).
  
  
  METHODS
  Participants stood on a ground-based oscillating platform for three 2-minute sessions for a total of 6 minutes per training session, twice weekly for 6 months. The controls did not receive any training. Both groups were evaluated at baseline and after 6 months.
  
  
  METHODS
  Muscle power, calculated from ground reaction forces produced by landing after jumping as high as possible on a forceplate, cortical bone density, and biomarkers of bone turnover.
  
  
  RESULTS
  Over 6 months, muscle power improved by about 5% in women who received the intervention, and it remained unchanged in controls (P=.004). Muscle force remained stable in both the intervention and control groups. No significant changes were observed in bone characteristics.
  
  
  CONCLUSIONS
  Reflex muscular contractions induced by vibration training improve muscle power in postmenopausal women.
authors.affiliation: Laboratory of Clinical Epidemiology, INRCA Geriatric Department, Florence, Italy.
authors.forename: Cosimo Roberto
authors.initials: CR
authors.lastname: Russo
authors.forename: Fulvio
authors.initials: F
authors.lastname: Lauretani
authors.forename: Stefania
authors.initials: S
authors.lastname: Bandinelli
authors.forename: Benedetta
authors.initials: B
authors.lastname: Bartali
authors.forename: Chiara
authors.initials: C
authors.lastname: Cavazzini
authors.forename: Jack M
authors.initials: JM
authors.lastname: Guralnik
authors.forename: Luigi
authors.initials: L
authors.lastname: Ferrucci
mesh_terms: D000704:Analysis of Variance; D004890:Erythema / Q000209:etiology; D005260:Female; D006801:Humans; D008875:Middle Aged; D009119:Muscle Contraction / Q000502:physiology; D018482:Muscle, Skeletal / Q000502:physiology*; D010806:Physical Education and Training / Q000379:methods*; D017698:Postmenopause / Q000502:physiology*; D011187:Posture / Q000502:physiology; D011537:Pruritus / Q000209:etiology; D016896:Treatment Outcome; D014732:Vibration