Evidence map›Paper›PMID 19649257›Full record

ArticlePloS one2009

The viscoelastic properties of passive eye muscle in primates. II: testing the quasi-linear theory.

Christian Quaia, Howard S Ying, Lance M Optican

Abstract read
In one paragraph

Article in PloS one, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.

0numbers the graph read from it
0cells of the map it votes in
12citing 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

12 citing papers in PubMed.

  1. Article
  2. Article
  3. Article
  4. [Research on adaptive quasi-linear viscoelastic model for nonlinear viscoelastic properties of in vivo soft tissues].Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi · 2017
    Article
  5. Article
  6. Article
  7. Article
  8. A nonlinear model of passive muscle viscosity.Journal of biomechanical engineering · 2011
    Article
  9. The nonlinearity of passive extraocular muscles.Annals of the New York Academy of Sciences · 2011
    Article
  10. Article
  11. Creep behavior of passive bovine extraocular muscle.Journal of biomedicine & biotechnology · 2011
    Article
  12. Article
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.

Christian QuaiaLaboratory of Sensorimotor Research, National Eye Institute, NIH, Bethesda, MD, USA. quaiac@nei.nih.gov
Howard S Ying
Lance M Optican

Funding

Neural Control Of GazeZIAEY000302 · NEI · NATIONAL EYE INSTITUTE · PI OPTICAN, LANCE M · 2009 to 2019
$10.2M
Wilmer Inst. Mentored Clinical Research Scholar ProgramK12EY015025 · NEI · JOHNS HOPKINS UNIVERSITY · PI James T Handa, Harry Alan Quigley · 2003 to 2026
$8.6M
Ocular Motor Adaptation in Health and DiseaseR01EY019347 · NEI · JOHNS HOPKINS UNIVERSITY · PI YING, HOWARD SHANN-CHERNG · 2008 to 2013
$1.9M
NEI NIH HHS EY15025NEI NIH HHS EY19347NEI NIH HHS K12 EY015025NEI NIH HHS R01 EY019347
6 · The paper itself

Abstract

We have extensively investigated the mechanical properties of passive eye muscles, in vivo, in anesthetized and paralyzed monkeys. The complexity inherent in rheological measurements makes it desirable to present the results in terms of a mathematical model. Because Fung's quasi-linear viscoelastic (QLV) model has been particularly successful in capturing the viscoelastic properties of passive biological tissues, here we analyze this dataset within the framework of Fung's theory.We found that the basic properties assumed under the QLV theory (separability and superposition) are not typical of passive eye muscles. We show that some recent extensions of Fung's model can deal successfully with the lack of separability, but fail to reproduce the deviation from superposition.While appealing for their elegance, the QLV model and its descendants are not able to capture the complex mechanical properties of passive eye muscles. In particular, our measurements suggest that in a passive extraocular muscle the force does not depend on the entire length history, but to a great extent is only a function of the last elongation to which it has been subjected. It is currently unknown whether other passive biological tissues behave similarly.

Indexed as

Models, BiologicalAnimalsElasticityMacaca mulattaOculomotor MusclesViscosity

Identifiers

PMID19649257
PMCPMC2715107

What OpenQuestion holds

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Registered trials

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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.