Evidence map›Paper›PMID 19337381›Full record

ArticlePloS one2009

The viscoelastic properties of passive eye muscle in primates. I: static forces and step responses.

Christian Quaia, Howard S Ying, Altah M Nichols, 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 19 papers.

0numbers the graph read from it
0cells of the map it votes in
19citing 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

19 citing papers in PubMed.

  1. Article
  2. Review
  3. Article
  4. Article
  5. Article
  6. Article
  7. Article
  8. Article
  9. Article
  10. Article
  11. Article
  12. Article
  13. Article
  14. A nonlinear model of passive muscle viscosity.Journal of biomechanical engineering · 2011
    Article
  15. The nonlinearity of passive extraocular muscles.Annals of the New York Academy of Sciences · 2011
    Article
  16. Article
  17. Creep behavior of passive bovine extraocular muscle.Journal of biomedicine & biotechnology · 2011
    Article
  18. Article
  19. 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

4 authors.

Christian QuaiaLaboratory of Sensorimotor Research, National Eye Institute, NIH, Bethesda, MD, USA. quaiac@nei.nih.gov
Howard S Ying
Altah M Nichols
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
NEURAL CONTROL OF GAZEZ01EY000302 · NEI · NATIONAL EYE INSTITUTE · PI OPTICAN, LANCE M · 1995 to 2008
$2.4M
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

The viscoelastic properties of passive eye muscles are prime determinants of the deficits observed following eye muscle paralysis, the root cause of several types of strabismus. Our limited knowledge about such properties is hindering the ability of eye plant models to assist in formulating a patient's diagnosis and prognosis. To investigate these properties we conducted an extensive in vivo study of the mechanics of passive eye muscles in deeply anesthetized and paralyzed monkeys. We describe here the static length-tension relationship and the transient forces elicited by small step-like elongations. We found that the static force increases nonlinearly with length, as previously shown. As expected, an elongation step induces a fast rise in force, followed by a prolonged decay. The time course of the decay is however considerably more complex than previously thought, indicating the presence of several relaxation processes, with time constants ranging from 1 ms to at least 40 s. The mechanical properties of passive eye muscles are thus similar to those of many other biological passive tissues. Eye plant models, which for lack of data had to rely on (erroneous) assumptions, will have to be updated to incorporate these properties.

Indexed as

AnimalsMacaca mulattaOculomotor MusclesViscosity

Identifiers

PMID19337381
PMCPMC2660417

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.