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

8주간의 체중을 이용한 저항운동 시 전신진동 유·무에 따른 노인 여성하지의 발바닥쪽굽힘근의 생체역학적 특성 변화

  • 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)
  • 한보람 (연세대학교 대학원 체육학과) ;
  • 이대연 (강남대학교 미래인재개발대학 실버산업공학과) ;
  • 정시우 (연세대학교 대학원 체육학과) ;
  • 이해동 (연세대학교 대학원 체육학과)
  • Received : 2014.11.10
  • Accepted : 2014.12.02
  • Published : 2014.12.31

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

Acknowledgement

Supported by : 한국연구재단

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