Whole-body vibration training improves balance control and sit-to-stand performance among middle-aged and older adults: a pilot randomized controlled trial.

Author: Ko MC1,2, Wu LS3, Lee S2, Wang CC1, Lee PF1,4, Tseng CY1, Ho CC1
Affiliation: <sup>1</sup>Department of Physical Education, Fu Jen Catholic University, No. 510 Zhongzheng Road, Xinzhuang District, New Taipei City, 24205 Taiwan. <sup>2</sup>Department of Kinesiology, Texas Woman's University, Denton, TX 762 USA. <sup>3</sup>Graduate Institute of Sports Training, University of Taipei, Taipei City, 11153 Taiwan. <sup>4</sup>Graduate Institute of Sport Coaching Science, Chinese Culture University, Taipei City, 11114 Taiwan.
Conference/Journal: Eur Rev Aging Phys Act.
Date published: 2017 Jul 18
Other: Volume ID: 14 , Pages: 11 , Special Notes: doi: 10.1186/s11556-017-0180-8. eCollection 2017. , Word Count: 287

BACKGROUND: Aging is associated with decreased balance, which increases falling risk. The objective of the current study was to determine the feasibility and effects of whole-body vibration (WBV) training on knee extensor muscle power, limits of stability, and sit-to-stand performance among community-dwelling middle-aged and older adults in the United States.

METHODS: A randomized pilot study with participant blinding was conducted. Feasibility outcomes included recruitment and compliance rate. Twenty-nine community-dwelling older adults were randomly assigned to perform body-weight exercises with either an individualized vibration frequency and amplitude, a fixed vibration frequency and amplitude, or no vibration. Isokinetic knee extensor power, limits of stability, and sit-to-stand tests were conducted before beginning the exercises (baseline) and after 8 weeks of training.

RESULTS: With a favorable recruitment rate (58%) and compliance rates (attrition 9%; adherence 85%), the intervention was deemed feasible. The limits of stability endpoint excursion score for the individualized frequency-amplitude group was increased by 8.8 (12.9%; P = 0.025) after training, and that group's maximum excursion score was increased by 9.2 (11.5%; P = 0.006) after training. The average weight transfer time score was significantly decreased by 0.2 s in the fixed group. The participants in the individualized group demonstrated a significant increase (3.2%) in weight rising index score after 8 weeks of WBV training.

CONCLUSIONS: WBV training is feasible for use with elderly people, and this study achieved good recruitment and compliance. The present paper suggests that 8 weeks of WBV training improves limits of stability and sit-to-stand performance. Future studies must determine whether WBV training improves other factors that affect posture control.

TRIAL REGISTRATION: This study was registered at the Texas Woman's University Institutional Review Board [TWU IRB 17632] on the 3rd of November 2014.

KEYWORDS: Balance; Limits of stability; Postural control; Sit-to-stand test; Whole-body vibration training

PMID: 28729887 PMCID: PMC5516349 DOI: 10.1186/s11556-017-0180-8