Author: Toosizadeh N1,2,3, Ehsani H4, Miramonte M4, Mohler J4,5,6
Affiliation: <sup>1</sup>Arizona Center on Aging (ACOA), Department of Medicine, College of Medicine, University of Arizona, Tucson, AZ, 85724-5072, USA. ntoosizadeh@aging.arizona.edu.
<sup>2</sup>Division of Geriatrics, General Internal Medicine and Palliative Medicine, Department of Medicine, University of Arizona, Tucson, AZ, USA. ntoosizadeh@aging.arizona.edu.
<sup>3</sup>Department of Biomedical Engineering, University of Arizona, Tucson, AZ, USA. ntoosizadeh@aging.arizona.edu.
<sup>4</sup>Arizona Center on Aging (ACOA), Department of Medicine, College of Medicine, University of Arizona, Tucson, AZ, 85724-5072, USA.
<sup>5</sup>Division of Geriatrics, General Internal Medicine and Palliative Medicine, Department of Medicine, University of Arizona, Tucson, AZ, USA.
<sup>6</sup>Department of Biomedical Engineering, University of Arizona, Tucson, AZ, USA.
Conference/Journal: Biomed Eng Online.
Date published: 2018 May 2
Other:
Volume ID: 17 , Issue ID: 1 , Pages: 51 , Special Notes: doi: 10.1186/s12938-018-0482-8. , Word Count: 221
BACKGROUND: Impairments in proprioceptive mechanism with aging has been observed and associated with fall risk. The purpose of the current study was to assess proprioceptive deficits among high fall risk individuals in comparison with healthy participants, when postural performance was disturbed using low-frequency mechanical gastrocnemius vibratory stimulation.
METHODS: Three groups of participants were recruited: healthy young (n = 10; age = 23 ± 2 years), healthy elders (n = 10; age = 73 ± 3 years), and high fall risk elders (n = 10; age = 84 ± 9 years). Eyes-open and eyes-closed upright standing balance performance was measured with no vibration, and 30 and 40 Hz vibration of both calves. Vibration-induced changes in balance behaviors, compared to baseline (no vibratory stimulation) were compared between three groups using multivariable repeated measures analysis of variance models.
RESULTS: Overall, similar results were observed for two vibration frequencies. However, changes in body sway due to vibration were more obvious within the eyes-closed condition, and in the medial-lateral direction. Within the eyes-closed condition high fall risk participants showed 83% less vibration-induced change in medial-lateral body sway, and 58% less sway velocity, when compared to healthy participants (p < 0.001; effect size = 0.45-0.64).
CONCLUSIONS: The observed differences in vibration effects on balance performance may be explained by reduced sensitivity in peripheral nervous system among older adults with impaired balance.
KEYWORDS: Body sway; Falling; Geriatrics; Mechanical stimulation; Somatosensory system; Wearable motion sensors
PMID: 29716599 PMCID: PMC5930964 DOI: 10.1186/s12938-018-0482-8