Evidence map›Paper›PMID 33296612›Full record

ArticleJournal of neurophysiology2021

Using asymmetry to your advantage: learning to acquire and accept external assistance during prolonged split-belt walking.

Natalia Sánchez, Surabhi N Simha, J Maxwell Donelan, James M Finley

Abstract read
In one paragraph

Article in Journal of neurophysiology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 40 papers.

0numbers the graph read from it
0cells of the map it votes in
40citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

40 citing papers in PubMed.

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  7. Gait Adaptation to Asymmetric Foot-Ground Compliance Applied by Robotic Footwear.IEEE transactions on neural systems and rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society · 2026
    Article
  8. Design and Characterization of the AdjuSST: An Adjustable Surface Stiffness Treadmill.IEEE/ASME transactions on mechatronics : a joint publication of the IEEE Industrial Electronics Society and the ASME Dynamic Systems and Control Division · 2025
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  9. Article
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  11. Article
  12. Article
  13. Author response to Panza et al.The Journal of physiology · 2025
    Article
  14. Article
  15. Identification of Subtypes of Post-Stroke and Neurotypical Gait Behaviors Using Neural Network Analysis of Gait Cycle Kinematics.IEEE transactions on neural systems and rehabilitation engineering : a publication of the IEEE Engineering in Medicine and Biology Society · 2025
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors.

Natalia SánchezDivision of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, California.
Surabhi N SimhaDepartment of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada.ORCID 0000-0001-5402-8998
J Maxwell DonelanDepartment of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada.
James M FinleyDivision of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, California.

Funding

Mentored Career DevelopmentKL2TR001854 · NCATS · UNIVERSITY OF SOUTHERN CALIFORNIA · PI Elizabeth Rhea Erwin Burner, Amy Elizabeth West · 2016 to 2026
$9.0M
Toward a Mechanistic Understanding of Optimization Principles Underlying Hemiparetic GaitR01HD091184 · NICHD · UNIVERSITY OF SOUTHERN CALIFORNIA · PI FINLEY, JAMES M. · 2018 to 2022
$1.5M
HHS | NIH | National Center for Advancing Translational Sciences (NCATS) KL2TR001854HHS | NIH | National Institute of Child Health and Human Development (NICHD) R01-HD0911NCATS NIH HHS KL2 TR001854NICHD NIH HHS R01 HD091184
6 · The paper itself

Abstract

People can learn to exploit external assistance during walking to reduce energetic cost. For example, walking on a split-belt treadmill affords the opportunity for people to redistribute the mechanical work performed by the legs to gain assistance from the difference in belts' speed and reduce energetic cost. Though we know what people should do to acquire this assistance, this strategy is not observed during typical adaptation studies. We hypothesized that extending the time allotted for adaptation would result in participants adopting asymmetric step lengths to increase the assistance they can acquire from the treadmill. Here, participants walked on a split-belt treadmill for 45 min while we measured spatiotemporal gait variables, metabolic cost, and mechanical work. We show that when people are given sufficient time to adapt, they naturally learn to step further forward on the fast belt, acquire positive mechanical work from the treadmill, and reduce the positive work performed by the legs. We also show that spatiotemporal adaptation and energy optimization operate over different timescales: people continue to reduce energetic cost even after spatiotemporal changes have plateaued. Our findings support the idea that walking with symmetric step lengths, which is traditionally thought of as the endpoint of adaptation, is only a point in the process by which people learn to take advantage of the assistance provided by the treadmill. These results provide further evidence that reducing energetic cost is central in shaping adaptive locomotion, but this process occurs over more extended timescales than those used in typical studies.

Indexed as

LearningAdaptation, PhysiologicalAdultFemaleHumansMaleWalkinglocomotionmechanical workmetabolic costmotor adaptationsplit-belt walking

Identifiers

PMID33296612
PMCPMC7948143

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.