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Effects of seated whole-body vibration on postural control of the trunk during unstable seated balance.
Clin Biomech (Bristol, Avon). 2008 May; 23(4):381-6.CB

Abstract

BACKGROUND

Low back disorders and their prevention is of great importance for companies and their employees. Whole-body vibration is thought to be a risk factor for low back disorders, but the neuromuscular, biomechanical, and/or physiological mechanisms responsible for this increased risk are unclear. The purpose of this study was to measure the acute effect of seated whole-body vibration on the postural control of the trunk during unstable seated balance.

METHODS

Twenty-one healthy subjects (age: 23 years (SD 4 years)) were tested on a wobble chair designed to measure trunk postural control. Measurements of kinematic variance and non-linear stability control were based on seat angle before and after 30 min of seated whole-body vibration (bandwidth=2-20 Hz, root-mean-squared amplitude=1.15m/s(2)).

FINDINGS

All measures of kinematic variance of unstable seated balance increased (P<0.05) after vibration including: ellipse area (35.5%), root-mean-squared radial lean angle (17.9%), and path length (12.2%). Measures of non-linear stability control also increased (P<0.05) including Lyapunov exponent (8.78%), stability diffusion analysis (1.95%), and Hurst rescaled range analysis (5.2%).

INTERPRETATION

Whole-body vibration impaired postural control of the trunk as evidenced by the increase in kinematic variance and non-linear stability control measures during unstable sitting. These findings imply an impairment in spinal stability and a mechanism by which vibration may increase low back injury risk. Future work should investigate the effects of whole-body vibration on the anatomical and neuromuscular components that contribute to spinal stability.

Authors+Show Affiliations

Slota GP
The Kevin P. Granata Musculoskeletal Biomechanics Laboratory, Virginia Polytechnic Institute and State University, 219 Norris Hall (0219), Blacksburg, VA 24061, USA. gslota@vt.edu
Granata KP
No affiliation info available
Madigan ML
No affiliation info available

MeSH

AdultBackBiomechanical PhenomenaFemaleHumansKinesthesisMaleMovementPostural BalancePostureTransducersVibration

Pub Type(s)

Controlled Clinical Trial
Journal Article

Language

eng

PubMed ID

18093708

Citation

Slota, Gregory P., et al. "Effects of Seated Whole-body Vibration On Postural Control of the Trunk During Unstable Seated Balance." Clinical Biomechanics (Bristol, Avon), vol. 23, no. 4, 2008, pp. 381-6.
Slota GP, Granata KP, Madigan ML. Effects of seated whole-body vibration on postural control of the trunk during unstable seated balance. Clin Biomech (Bristol, Avon). 2008;23(4):381-6.
Slota, G. P., Granata, K. P., & Madigan, M. L. (2008). Effects of seated whole-body vibration on postural control of the trunk during unstable seated balance. Clinical Biomechanics (Bristol, Avon), 23(4), 381-6.
Slota GP, Granata KP, Madigan ML. Effects of Seated Whole-body Vibration On Postural Control of the Trunk During Unstable Seated Balance. Clin Biomech (Bristol, Avon). 2008;23(4):381-6. PubMed PMID: 18093708.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of seated whole-body vibration on postural control of the trunk during unstable seated balance. AU - Slota,Gregory P, AU - Granata,Kevin P, AU - Madigan,Michael L, Y1 - 2008/02/21/ PY - 2007/09/11/received PY - 2007/10/25/revised PY - 2007/11/07/accepted PY - 2007/12/21/pubmed PY - 2008/8/22/medline PY - 2007/12/21/entrez SP - 381 EP - 6 JF - Clinical biomechanics (Bristol, Avon) JO - Clin Biomech (Bristol, Avon) VL - 23 IS - 4 N2 - BACKGROUND: Low back disorders and their prevention is of great importance for companies and their employees. Whole-body vibration is thought to be a risk factor for low back disorders, but the neuromuscular, biomechanical, and/or physiological mechanisms responsible for this increased risk are unclear. The purpose of this study was to measure the acute effect of seated whole-body vibration on the postural control of the trunk during unstable seated balance. METHODS: Twenty-one healthy subjects (age: 23 years (SD 4 years)) were tested on a wobble chair designed to measure trunk postural control. Measurements of kinematic variance and non-linear stability control were based on seat angle before and after 30 min of seated whole-body vibration (bandwidth=2-20 Hz, root-mean-squared amplitude=1.15m/s(2)). FINDINGS: All measures of kinematic variance of unstable seated balance increased (P<0.05) after vibration including: ellipse area (35.5%), root-mean-squared radial lean angle (17.9%), and path length (12.2%). Measures of non-linear stability control also increased (P<0.05) including Lyapunov exponent (8.78%), stability diffusion analysis (1.95%), and Hurst rescaled range analysis (5.2%). INTERPRETATION: Whole-body vibration impaired postural control of the trunk as evidenced by the increase in kinematic variance and non-linear stability control measures during unstable sitting. These findings imply an impairment in spinal stability and a mechanism by which vibration may increase low back injury risk. Future work should investigate the effects of whole-body vibration on the anatomical and neuromuscular components that contribute to spinal stability. SN - 0268-0033 UR - https://www.unboundmedicine.com/medline/citation/18093708/Effects_of_seated_whole_body_vibration_on_postural_control_of_the_trunk_during_unstable_seated_balance_ DB - PRIME DP - Unbound Medicine ER -