title: Effects of Eight Months of Whole-Body Vibration Training on the Muscle Mass and Functional Capacity of Elderly Women.
abstract: Few intervention studies have used whole-body vibration (WBV) training in the elderly, and there is inconclusive evidence about its health benefits. We examined the effect of 8 months of WBV training on muscle mass and functional capacity in elderly women. A total of 37 women (aged 82.4 ± 5.7 years) voluntarily participated in this study. Subjects were randomly assigned to a vibration group (n = 19) or a control group (n = 18). The vibration group trained on a vertical vibration platform twice a week. The control group was requested not to change their habitual lifestyle. The quadriceps femoris muscle cross-sectional area was determined by magnetic resonance imaging. All participants were evaluated by a battery of tests (Senior Fitness Test) to determine their functional capacity, as well as handgrip strength and balance/gait. General linear repeated-measure analysis of variance (group by time) was performed to examine the effect of the intervention on the outcomes variables. After 8 months, nonstatistically significant differences in the quadriceps CSA (pre-training: 8,516.16 ± 1,271.78 mm² and post-training: 8,671.63 ± 1,389.03 mm²) (p > 0.05) were found in the WBV group (Cohen's d: -0.12), whereas the CON group significantly decreased muscle mass (pre-training: 9,756.18 ± 1,420.07 mm² and post-training: 9,326.82 ± 1,577.53 mm²), with moderate effect size evident (Cohen's d: 0.29). In both groups, no changes were observed in the functional capacity, handgrip strength and balance/gait. The WBV training could prevent the loss of quadriceps CSA in elderly women.
authors.affiliation: 1Department of Biomedical Sciences, Faculty of Veterinary, University Campus of Vegazana, University of León, León, Spain; 2Institute of Biomedicine (IBIOMED), León, Spain; 3Department of Preventive Medicine, Faculty of Medicine, University of São Paulo, São Paulo, Brazil; 4Research Institute of Hospital, Madrid, Spain; 5Laboratory of Human Movement, Pontificia University Católica of Valparaíso, Valparaíso, Chile; 6Faculty of Education, University Autónoma of Chile, Santiago, Chile; and 7Faculty of Health and Sport Science, Department of Physiotherapy and Nursing, University of Zaragoza, Huesca, Spain.
authors.forename: Fernanda
authors.initials: F
authors.lastname: Santin-Medeiros
authors.forename: Juan P
authors.initials: JP
authors.lastname: Rey-López
authors.forename: Alejandro
authors.initials: A
authors.lastname: Santos-Lozano
authors.forename: Carlos S
authors.initials: CS
authors.lastname: Cristi-Montero
authors.forename: Nuria
authors.initials: N
authors.lastname: Garatachea Vallejo
mesh_terms: D000203:Activities of Daily Living; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005684:Gait; D018737:Hand Strength; D006801:Humans; D017063:Outcome Assessment, Health Care; D026741:Physical Therapy Modalities; D004856:Postural Balance; D052097:Quadriceps Muscle / Q000033:anatomy & histology*; D014732:Vibration