Young adults perceive small disturbances to their walking balance even when distracted.
Daniel J Liss, Hannah D Carey, Sergiy Yakovenko and 1 others
PMID 34740056WHAT IT FOUND
Young adults detected very small slip-like disturbances on a treadmill, even while counting backwards.
They perceived speed changes less than 10% of their walking speed. This suggests conscious perception of balance loss is robust to distraction in healthy young people.
Key findings
01Young adults perceived slip-like disturbances with a threshold of approximately 0.07 to 0.09 m/s, which is less than 10% of their self-selected walking speed.
02Adding a cognitive task (counting backwards) did not significantly change the threshold for perceiving these disturbances.
03There was a significant dual-task cost to counting rate, but not to counting accuracy, during the perturbation trials.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
The study included only healthy young adults, so findings cannot be generalized to older adults or those with balance impairments. The cognitive task (counting backwards) may have been too easy for young adults, potentially underestimating the impact of distraction. The baseline cognitive performance was measured while seated, not walking, making it difficult to isolate the specific cost of the perturbation on the cognitive task. The experiment used a treadmill, and slip durations were slightly longer than those in real-world overground walking.
Declared interests
None declared.
The easy way to misread this
Do not assume that healthy young adults can maintain perceptual acuity under all distracting conditions. The cognitive task used was relatively simple, and the study did not test more complex or demanding distractions that might overwhelm attentional resources.