The Journal of Korean Physical Therapy

The Korean Society of Physical Therapy (대한물리치료학회)
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Analysis of Muscle Activation related to Postural Stability according to Different Frequency of Whole Body Vibration during Quiet Standing

중립 선 자세에서의 전신진동 주파수에 따른 자세 안정근의 근활성 분석

  • Seo, Hye-Jung (Department of Physical Therapy, General Graduate School, Catholic University of Daegu) ;
  • Kim, Joong-Hwi (Department of Physical Therapy, College of Medical Science, Catholic University of Daegu)
  • 서혜정 (대구가톨릭대학교 일반대학원 물리치료학과) ;
  • 김중휘 (대구가톨릭대학교 의료과학대학 물리치료학과)
  • Received : 2013.09.10
  • Accepted : 2013.10.15
  • Published : 2013.10.25
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Abstract

Purpose: The aimed of this study was to investigate muscle activation related to postural stability according to different frequency of whole body vibration during quiet standing, to identify the most effective training conditions that cause the highest neuromuscular responses, and to evaluate the difference of EMG activation according to the anatomical position of the muscle - proximal or distal from the vibration platform. Methods: Eighteen healthy subjects voluntarily participated in this single-group, repeated-measures study in which EMG data from upper trapezius, rectus abdominalis, external oblique abdominalis, elector spinae, gluteus maximus, rectus femoris, semitendinosus, and gastrocnemius were collected over different frequencies (0-5-10-15-20-25Hz) for each subject during quiet standing. Results: We observed a statistically significant difference in the mean values of %RVC of muscular activation according to different frequencies of whole body vibration during quiet standing in all muscles (p<0.05). Conclusion: Our results indicate that lower frequencies of vibration result in low muscular activation, and higher frequencies elicit high muscular activation. However, the most effective training condition that caused the highest activation was 20 Hz. In addition, the proximally located lower extremity muscles (GCM, RF, ST, GM) showed higher activation than the distally located trunk and neck muscles (ES, EO, RA, UT) together with increasing frequency.

Keywords

References

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