Kinematic synergies in over-ground slip recovery outcomes: Distinct strategies or a single strategy?
Shuaijie Wang, Yi-Chung Pai, Tanvi Bhatt
PMID 33653642WHAT IT FOUND
Split falls and recoveries use similar movement patterns before and during the initial slip response, but differ significantly in the late recovery phase.
Feet-forward falls resemble recoveries until the final step. This suggests split fallers may need more intensive, multi-phase training than feet-forward fallers.
Key findings
01Kinematic synergies were highly similar across recovery, split fall, and feet-forward fall groups during the pre-slip and early-reactive phases, with correlation coefficients near 0.99.
02In the late-reactive phase, split fall strategies differed significantly from recoveries, whereas feet-forward fall strategies remained similar to recoveries.
03The study suggests split fallers may require higher training dosage to address vulnerabilities in multiple phases, while feet-forward fallers may only need late-phase intervention.
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 was observational and did not test whether the proposed training dosages or strategies actually reduce falls. All slip perturbations were applied to the right leg, which was the dominant side for all participants, so results may not apply to slips on the non-dominant leg. The classification of fall types relied on specific kinematic thresholds and video verification, which may not be easily replicated in a clinical setting. The study describes movement patterns but does not measure muscle activation or neural control directly, inferring 'strategies' from kinematic data alone.
Declared interests
The authors declared no conflicts of interest. The research was supported by the NIH.
The easy way to misread this
Do not assume that the proposed training intensities for split versus feet-forward fallers are proven effective. This paper identifies differences in movement patterns but does not test whether changing these patterns reduces fall risk. The suggestions for tailored interventions are theoretical extrapolations from the kinematic data.