The impact of walking on the perception of multichannel electrotactile stimulation in individuals with lower-limb amputation and able-bodied participants.
Romain Valette, Jose Gonzalez-Vargas, Strahinja Dosen
PMID 37592336WHAT IT FOUND
Walking reduces sensitivity to electrical feedback on the thigh in able-bodied people, requiring stronger or more spaced-out signals.
In amputees, the effect varies wildly by person and socket fit, meaning calibration must happen while walking, not sitting.
Key findings
01Able-bodied participants required significantly higher stimulation intensity to feel the sensation (sensation threshold) and to find it uncomfortable (discomfort threshold) while walking compared to sitting.
02Able-bodied participants were less able to distinguish small changes in stimulation intensity (higher Just Noticeable Difference) and had fewer distinct intensity levels available (lower Number of Distinct Intervals) while walking.
03For participants with lower-limb amputation, changes in perception while walking were inconsistent and subject-specific, with some showing improved sensitivity and others reduced sensitivity depending on the measure and individual.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The sample size of participants with amputations was very small (n=6), preventing statistical analysis of this group and limiting conclusions to case-by-case observations. The study was conducted on a treadmill, which may not fully replicate overground walking dynamics or the cognitive load of real-world environments. Two transfemoral amputees reached the maximum output of the stimulation device (9.5 mA) without reporting discomfort, suggesting potential desensitization or device limitations that could skew threshold data. The study did not control for or analyze the specific impact of different socket types, liner materials, or amputation etiologies on the observed variability.
Declared interests
The study was funded by the H2020 Marie Skłodowska-Curie Actions. No other conflicts of interest were declared in the provided text.
The easy way to misread this
Do not assume that the clear impairment in perception seen in able-bodied participants applies uniformly to people with amputations. The amputee data was inconsistent and subject-specific, likely due to socket interaction, meaning individual calibration during walking is essential.