Subthreshold Vibration Influences Standing Balance but Has Unclear Impact on Somatosensation in Persons With Transtibial Amputations

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.

Vascular and Neural Response to Focal Vibration, Sensory Feedback, and Piezo Ion Channel Signaling

“…For example, the frequency range from 75-120 Hz affected motor control [221] and improved walking speed [222]. Subthreshold vibration improved balance in people with unilateral transtibial amputations but did not change measures of somatosensation [533]. Calf muscle vibration at 120 Hz, 1.2 mm improved chair rises, timed up-and-go test, and 6 min walk test in people with peripheral artery disease [534].…”