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http://dx.doi.org/10.5103/KJSB.2014.24.4.399

Changes in the Biomechanical Properties of Ankle Plantarflexors Following 8-week Resistance Training with or without Whole-Body Vibration in Older Women  

Han, Bo-Ram (Department of Physical Education, Graduate School of Yonsei University)
Lee, Dae-Yeon (Department of Silver Industrial Engineering, College of Future Human Resource Development, Kangnam University)
Jeong, Si-Woo (Department of Physical Education, Graduate School of Yonsei University)
Lee, Hae-Dong (Department of Physical Education, Graduate School of Yonsei University)
Publication Information
Korean Journal of Applied Biomechanics / v.24, no.4, 2014 , pp. 399-415 More about this Journal
Abstract
The aim of this study was to investigate the effect of resistance training with and without whole-body vibration(WBV) on the biomechanical properties of the plantarflexor in the elderly women (>60 yrs., n=35). Thirty-five volunteers were randomly assigned to a resistance training with WBV group (RVT, n=14), a resistance training without WBV (RT, n=11), and a non-training control group (CON, n=10). The RVT and the RT groups participated in the training sessions three times a week for 8 weeks, followed by a 4-week detraining period. The CON group was instructed to refrain from any type of resistance training. To assess strength and activation of the plantarflexor muscles, maximum isometric ankle plantarflexion torque and muscle activation of the triceps surae muscles were measured using dynamometry, twitch interpolation technique and electromyography at four different ankle joint angles. Also, the lower extremity function was assessed by vertical jumping. The measurements were performed prior to, 2 and 8 weeks after the training and after a 4-week detraining period. Following the 8-week training sessions, an increase in the isometric plantarflexion strength was found to be greater for the RVT compared with the RT group (p<.05). Muscle inhibition was significantly decreased after training than before training only for the RVT (p<.05). Following the detraining period, a decrease in isometric plantarflexors strength and a increases in muscle inhibition were significantly less in the RVT compared with the RT group. In conclusion, the exercise with WBV is a feasible training modality for the elderly and seems to have a boosting effect when used with conventional resistance training.
Keywords
Aging; Resistance Training; Whole-Body Vibration; Detraining; Muscle Property; Electromyography; Twitch Interpolation Technique; Muscle Inhibition; Ultrasound Imaging;
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