TY - JOUR AU - Spiliopoulou, Styliani I. A2 - Spiliopoulou, Styliani I. A2 - Amiridis, Ioannis G. A2 - Tsigganos, Georgios A2 - Hatzitaki, Vassilia DB - BISp DP - BISp KW - Frau KW - Gleichgewichtsvermögen KW - Haltungsstabilität KW - Kraftzuwachs KW - Leistungssteigerung KW - Muskelkraft KW - Sportmedizin KW - Sprunggelenk KW - Trainingseffektivität KW - Trainingswirkung KW - Trainingswissenschaft KW - Untersuchung, empirische KW - Untrainierter KW - Vibration KW - Vibrationstraining LA - eng TI - Side-alternating vibration training for balance and ankle muscle strength in untrained women TT - Seitenalternierendes Vibrationstraining für das Gleichgewicht und die Kraft der Sprunggelenk-Muskulatur bei untrainierten Frauen PY - 2013 N2 - Context: Side-alternating vibration (SAV) may help reduce the risk of falling by improving body balance control. Such training has been promoted as a strength-training intervention because it can increase muscle activation through an augmented excitatory input from the muscle spindles. Objective: To determine the effect of SAV training on static balance during 3 postural tasks of increasing difficulty and lower limb strength. Design: Randomized controlled clinical trial. Setting: Laboratory. Patients or Other Participants: A total of 21 healthy women were divided into training (n = 11; age = 43.35 ± 4.12 years, height = 169 ± 6.60 cm, mass = 68.33 ± 11.90 kg) and control (n = 10; age = 42.31 ± 3.73 years, height = 167 ± 4.32 cm, mass = 66.29 ± 10.74 kg) groups. Intervention(s): The training group completed a 9-week program during which participants performed 3 sessions per week of ten 15-second isometric contractions with a 30-second active rest of 3 exercises (half-squat, wide-stance squat, 1-legged half-squat) on an SAV plate (acceleration = 0.91–16.3g). The control group did not participate in any form of exercise over the 9-week period. Main Outcome Measure(s): We evaluated isokinetic and isometric strength of the knee extensors and flexors and ankle plantar flexors, dorsiflexors, and evertors. Static balance was assessed using 3 tasks of increasing difficulty (quiet bipedal stance, tandem stance, 1-legged stance). The electromyographic activity of the vastus lateralis, semitendinosus, medial gastrocnemius, tibialis anterior, and peroneus longus was recorded during postural task performance, baseline and pretraining, immediately posttraining, and 15 days posttraining. Results: After training in the training group, ankle muscle strength improved (P = .03), whereas knee muscle strength remained unaltered (P = .13). Improved ankle-evertor strength was observed at all angular velocities (P = .001). Postural sway decreased in both directions but was greater in the mediolateral (P < .001) than anteroposterior (P = .02) direction. The electromyographic activity of the peroneus longus increased during the sharpened tandem (P = .001) and 1-legged tasks (P = .007). No changes were seen in the control group for any measures. Conclusions: The SAV training could enhance ankle muscle strength and reduce postural sway during static balance performance. The reduction in mediolateral sway could be associated with the greater use of ankle evertors due to their strength improvement. Verf.-Referat L2 - https://dx.doi.org/10.4085/1062-6050-48.4.03 DO - 10.4085/1062-6050-48.4.03 SP - S. 590-600 SN - 1062-6050 JO - Journal of athletic training IS - 5 VL - 48 M3 - Gedruckte Ressource ID - PU201311007774 ER -