Abstract
Stochastic resonance has been successfully used to improve human movement when using subthreshold vibration. Recent work has shown promise in improving mobility in individuals with unilateral lower limb amputations. Furthering this work, we present an investigation of two different signal structures in the use of stochastic resonance to improve mobility in individuals with unilateral lower limb amputations. Cutaneous somatosensation and standing balance measures using spatial and temporal analysis were assessed. There were no differences in the somatosensation measures, but differences in the temporal characteristics of the standing measures were seen with the various vibration structures when compared to no vibration, one of which suggesting mass may play an important role in determining who may or may not benefit from this intervention. Stochastic resonance employed with subthreshold vibration influences mobility in individuals with unilateral amputations, but the full direction and extent of influence is yet to be understood.
Highlights
Across the globe, lower limb amputations occur daily and are life altering events that may have grave consequences on an individual’s mental and physical state (Grzebienet al., 2017)
The purpose of this study was to investigate the effects of subthreshold pink and white vibration on measures of somatosensation, and standing balance to determine the potential impact of subthreshold vibration in improving mobility of individuals with a unilateral transtibial amputation
We assessed the effects of subthreshold vibration on measures of the magnitude of postural sway using linear mixed effect (LME) models
Summary
Lower limb amputations occur daily and are life altering events that may have grave consequences on an individual’s mental and physical state (Grzebienet al., 2017). Amputations are associated with balance deficits, an increased fall risk, morbidity, mortality, and decreased quality of life (Ku et al, 2014; Grzebienet al., 2017). May have a synergistic effect with balance disturbances seen with unilateral lower limb amputations (Hlavackova et al, 2011; Costello et al, 2012). To address these issues, patients go through physical rehabilitation. Improving the somatosensation of the residual limb may improve standing balance (Quai et al, 2005; Likens et al, 2020)
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