Evidence map›Paper›PMID 32843057›Full record

ArticleJournal of neuroengineering and rehabilitation2020

Rectus femoris hyperreflexia contributes to Stiff-Knee gait after stroke.

Tunc Akbas, Kyoungsoon Kim, Kathleen Doyle, Kathleen Manella, Robert Lee, Patrick Spicer, Maria Knikou, James Sulzer

Registry-linked trialOpen access · goldAbstract read
In one paragraph

Article in Journal of neuroengineering and rehabilitation, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT06113965 (Neural Operant Conditioning to Improve Walking After Stroke), which is not on this map. Cited by 28 papers.

0numbers the graph read from it
0cells of the map it votes in
28citing papers in PubMed
3.6field-weighted citation impact, top 6% of its field
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.

NCT06113965 nawithdrawnnot on this mapstarted 2024, after this paper: background citation

Neural Operant Conditioning to Improve Walking After Stroke

TypeinterventionalSponsorMetroHealth Medical CenterRan2024 to 2028Enrolled0ConditionsStroke, Chronic Stroke, Gait, Hemiplegic, Gait, SpasticArmsPeripheral Nerve Stimulation
3 · Its place in the literature

Who cites it

28 citing papers in PubMed, 48 citations in OpenAlex.

  1. Article
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  3. Task-Based Mapping of Compensatory Strategies and Movement Kinematics After Stroke: A Systematic Scoping Review.Physiotherapy research international : the journal for researchers and clinicians in physical therapy · 2026
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  4. Article
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  8. Mechanisms of Post-stroke Stiff-Knee Gait: A Narrative Review.American journal of physical medicine & rehabilitation · 2025
    Review
  9. Deficit in intersegmental torques drives post-stroke stiff-knee gait.medRxiv : the preprint server for health sciences · 2025
    Article
  10. Does Gait Assistance Modulate Reflex Excitability in Those with Spasticity? A Preliminary Study.IEEE ... International Conference on Rehabilitation Robotics : [proceedings] · 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

8 authors at 6 institutions in 1 country.

Tunc AkbasSchool of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA.
Kyoungsoon KimWalker Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX, USA.
Kathleen DoyleWalker Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX, USA.
Kathleen ManellaUniversity of St. Augustine for Health Sciences, Austin, TX, USA.
Robert LeeSt. David's Medical Center, Austin, TX, USA.
Patrick SpicerSeton Brain and Spine Institute, Ascension Texas, University of Texas at Austin, Austin, TX, USA.
Maria KnikouGraduate Center of the City University of New York and Physical Therapy Department, College of Staten Island, New York, NY, USA.
James SulzerWalker Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX, USA. james.sulzer@austin.utexas.edu.ORCID 0000-0001-9700-3045
Walker (United States) · USCentral Texas Spine Institute · USHarvard University · USSt David's Medical Center · USThe Graduate Center, CUNY · USUniversity of St. Augustine for Health Sciences · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundStiff-Knee gait (SKG) after stroke is often accompanied by decreased knee flexion angle during the swing phase. The decreased knee flexion has been hypothesized to originate from excessive quadriceps activation. However, it is unclear whether hyperreflexia plays a role in this activation. The goal of this study was to establish the relationship between quadriceps hyperreflexia and knee flexion angle during walking in post-stroke SKG.

methodsThe rectus femoris (RF) H-reflex was recorded in 10 participants with post-stroke SKG and 10 healthy controls during standing and walking at the pre-swing phase. In order to attribute the pathological neuromodulation to quadriceps muscle hyperreflexia and activation, healthy individuals voluntarily increased quadriceps activity using electromyographic (EMG) feedback during standing and pre-swing upon RF H-reflex elicitation.

resultsWe observed a negative correlation (R = - 0.92, p = 0.001) between knee flexion angle and RF H-reflex amplitude in post-stroke SKG. In contrast, H-reflex amplitude in healthy individuals in presence (R = 0.47, p = 0.23) or absence (R = - 0.17, p = 0.46) of increased RF muscle activity was not correlated with knee flexion angle. We observed a body position-dependent RF H-reflex modulation between standing and walking in healthy individuals with voluntarily increased RF activity (d = 2.86, p = 0.007), but such modulation was absent post-stroke (d = 0.73, p = 0.296).

conclusionsRF reflex modulation is impaired in post-stroke SKG. The strong correlation between RF hyperreflexia and knee flexion angle indicates a possible regulatory role of spinal reflex excitability in post-stroke SKG. Interventions targeting quadriceps hyperreflexia could help elucidate the causal role of hyperreflexia on knee joint function in post-stroke SKG.

Indexed as

AdultBiomechanical PhenomenaFemaleGait Disorders, NeurologicHumansKnee JointMaleMiddle AgedQuadriceps MuscleReflex, AbnormalStrokeWalkingH-reflexHyperreflexiaPost-stroke gaitSpasticityStiff-knee gait

Identifiers

PMID32843057
PMCPMC7448457
OpenAlexW3081210095

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

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.