Effects of supraspinal feedback on human gait: rhythmic auditory distortion.
Arturo Forner-Cordero, João Pedro Pinho, Guilherme Umemura and 4 others
PMID 31870399WHAT IT FOUND
Healthy young walkers kept pace with metronome beeps even when the rhythm changed by 1 millisecond without noticing.
They adjusted step length to hold treadmill speed, but mismatch grew when the beep period moved away from the first rhythm.
Key findings
01Healthy young adults kept footfall timing locked to a metronome beep and changed step length to hold treadmill speed when the beep period was altered by 1 msec every two beeps.
02The rhythm change was subliminal: participants raised their hand randomly when the metronome was constant, and correct notices occurred only late in the changing blocks.
03Timing error grew when the beep period moved away from the original rhythm, and after returning to it from the slower rhythm some participants still stepped after the beep.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study used 22 healthy undergraduate students, so it does not show what would happen in patients. Testing happened in a single laboratory session on a treadmill at a fixed speed, not in everyday walking. The rhythm changes were tiny, only 1 msec every two beeps, so the result may not apply to larger changes. The carry-over after the rhythm returned was not significant, so the paper does not prove lasting change. The authors discuss possible use for movement disorders, but that is a suggestion from the discussion, not a tested clinical outcome.
Declared interests
The paper names a funder but does not provide a fuller author conflict statement.
The easy way to misread this
Do not treat this as evidence that metronome therapy improves gait in patients. The study tested 22 healthy young adults on a treadmill, and the authors only suggest future use in movement disorders.