Simulation of human gait with body weight support: benchmarking models and unloading strategies.
Salil Apte, Michiel Plooij, Heike Vallery
PMID 32586398WHAT IT FOUND
Computer simulations suggest a tuned-spring system for body weight support may allow walking to look more natural than a constant-force system.
This is a theoretical model comparison. It has not been tested on patients, so it does not yet change clinical practice.
Key findings
01A tuned-spring strategy resulted in the highest maximum feasible body weight support and the least change in gait dynamics across the tested models.
02The Spring Loaded Inverted Pendulum (SLIP) model matched human experimental data more closely than the Simplest Walking and Muscle-reflex models.
03The counterweight strategy typically produced the lowest maximum feasible body weight support levels.
STILL TO COME
How it was doneWhat they found
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What it does not show
This was a computer simulation only. No human subjects were tested, so the findings do not prove that these systems work better in patients. The study only looked at movement in the sagittal plane (forward and backward). It did not account for balance or side-to-side movements, which are critical in rehabilitation. The models were compared to data from healthy walkers, not individuals with neurological impairments like stroke or spinal cord injury. The models could not simulate stable walking above 40-50% body weight support, limiting the comparison at higher unloading levels.
Declared interests
Funded by Horizon 2020 Framework Programme. No other conflicts declared.
The easy way to misread this
Do not assume that a tuned-spring harness will improve gait training outcomes for your patients. This paper compares mathematical models, not clinical results. The authors state this work only merits experimental investigation, not implementation.