title: Vibration effects on static balance and strength.
abstract: The purpose of this study was to investigate the effects of a vibration training protocol and a conventional strength training program consisting of similar exercises on knee extensors and flexors strength and postural sway in middle-aged women. 38 women were randomly assigned into a Vibration Group (n=12, static and dynamic exercises on a vibration plate, frequency: 15-25 Hz, amplitude: 2-12.8 cm), a Strength Group (n=16, same exercises without vibration) and a Control Group (n=10). Both experimental groups trained for 12 weeks (3 sessions/w). Static balance was assessed in 3 tasks of increasing difficulty: Normal Quiet Stance, Sharpened Tandem, and One-Legged Stance. Postural sway was evaluated using the Centre of Pressure variations in the Anterior/Posterior and Medio/Lateral direction. Eccentric and concentric strength of knee extensors and flexors was recorded using a Cybex dynamometer. After vibration training, postural sway significantly decreased in both directions for the vibration group in all tasks (p<0.05), whereas no significant differences were observed for the other groups. Isokinetic strength significantly (p<0.05) increased for both experimental groups at selected angular velocities. It was concluded that side-alternating vibration could have beneficial effects on static balance control for middle-aged women. Gains in isokinetic strength were quite similar for both experimental groups.
authors.affiliation: Department of Physical Education and Sport Sciences, Serres, Aristotle University of Thessaloniki, Greece.
authors.forename: S I
authors.initials: SI
authors.lastname: Spiliopoulou
authors.forename: I G
authors.initials: IG
authors.lastname: Amiridis
authors.forename: G
authors.initials: G
authors.lastname: Tsigganos
authors.forename: D
authors.initials: D
authors.lastname: Economides
authors.forename: E
authors.initials: E
authors.lastname: Kellis
mesh_terms: D015444:Exercise / Q000502:physiology; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000502:physiology; D008875:Middle Aged; D053580:Muscle Strength / Q000502:physiology*; D053581:Muscle Strength Dynamometer; D018482:Muscle, Skeletal / Q000502:physiology; D004856:Postural Balance / Q000502:physiology; D055070:Resistance Training; D014732:Vibration