Evidence map›Paper›PMID 21404288›Full record

ArticleMuscle & nerve2011

Effect of knee position on quadriceps muscle force steadiness and activation strategies.

Chandramouli Krishnan, Eric J Allen, Glenn N Williams

Abstract readComparative Study
In one paragraph

Article in Muscle & nerve, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 35 papers.

0numbers the graph read from it
0cells of the map it votes in
35citing 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

35 citing papers in PubMed.

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  11. Evaluation of Meniscal Load and Load Distribution in the Sound Canine Stifle at Different Angles of Flexion.Veterinary and comparative orthopaedics and traumatology : V.C.O.T · 2024
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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

3 authors.

Chandramouli KrishnanSearle Laboratory, Sensory Motor Performance Program, Rehabilitation Institute of Chicago, Chicago, Illinois, USA. ckrishnan@ric.org
Eric J Allen
Glenn N Williams

Funding

MULTICENTER CAREER DEVELOPMENT PROGRAM FOR PHYSICAL AND OCCUPATIONAL THERAPYK12HD055931 · NICHD · WASHINGTON UNIVERSITY · PI HAYES, MARCIE HARRIS · 2007 to 2021
$12.7M
NICHD NIH HHS K12 HD055931
6 · The paper itself

Abstract

introductionIn this study we investigated the effect of knee position on quadriceps force steadiness and activation strategies.

methodsQuadriceps force steadiness was evaluated in 22 volunteers at two knee positions by testing their ability to regulate submaximal force. Muscle activation strategies were studied in both time and frequency domains using surface electromyography.

resultsQuadriceps force fluctuations and the associated agonist and antagonist activity were significantly higher at 90° than at 30° of flexion (P < 0.05). The quadriceps median frequency recorded at 30° was significantly higher than at 90° of flexion (P < 0.05). Regression analyses revealed that force steadiness was related to quadriceps activation and median frequency (P < 0.001), but not to hamstring coactivation (P > 0.05).

conclusionsThe results indicate that knee position significantly affects quadriceps force steadiness and activation strategies. This finding may have important implications for designing a force control testing protocol and interpreting test results.

Indexed as

TorqueAdultElectromyographyFemaleHumansKnee JointMaleMuscle ContractionMuscle StrengthPostureQuadriceps MuscleYoung Adult

Identifiers

PMID21404288
PMCPMC3077092

What OpenQuestion holds

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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.