Evidence map›Paper›PMID 8006830›Full record

ArticleThe Journal of physiology1994

Force-velocity relation for frog muscle fibres: effects of moderate fatigue and of intracellular acidification.

N A Curtin, K A Edman

Open access · greenAbstract read
In one paragraph

Article in The Journal of physiology, 1994. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 22 papers.

0numbers the graph read from it
0cells of the map it votes in
22citing papers in PubMed
3.9field-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.

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

22 citing papers in PubMed, 68 citations in OpenAlex.

  1. Trial
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  3. From fibre to function: are we accurately representing muscle architecture and performance?Biological reviews of the Cambridge Philosophical Society · 2022
    Review
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  14. Effects of fatigue on the catchlike property in a turtle hindlimb muscle.Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology · 2003
    Article
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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

2 authors at 1 institution in 1 country.

N A CurtinDepartment of Pharmacology, University of Lund, Sweden.
K A Edman
Lund University · SE

Funding

Wellcome Trust
6 · The paper itself

Abstract

1. Intact frog single fibres were investigated under control conditions (1 s tetanus every 2, 3 or 5 min) and during moderate fatigue (interval between tetani 15 or 30 s). 2. Fatigue reduced isometric force (P0) by 25.8 +/- 1.6% (S.E.M.; n = 13) and depressed the maximum velocity of shortening (Vmax) by 10.2 +/- 2.2% (n = 13). The force-velocity relation became less curved, a/P0* (see Methods) being increased by 29.5 +/- 8.8% (n = 13). Thus, power was less affected than isometric force or Vmax. 3. The velocity of unloaded shortening (V0), from slack test measurements, was reduced proportionally more than Vmax during fatigue. Under control conditions V0 was larger than Vmax, but during fatigue their values were not significantly different. 4. Stiffness during shortening was reduced during fatigue indicating fewer attached cross-bridges in fatigue. Force was reduced more than stiffness indicating that, on average, there is less force per attached cross-bridge. 5. The force-lengthening velocity relation showed that the ability to resist forces greater than isometric was well preserved in fatigue. 6. Compared with fatigue, intracellular acidification with CO2 produced a smaller reduction in isometric force. However, reduction in Vmax was not significantly different from that in fatigue. These results are consistent with both inorganic phosphate and H+ increasing in fatigue, but only H+ increasing during acidification, and isometric force being reduced by both, Vmax being sensitive only to H+.

Indexed as

AcidsAnimalsElasticityIntracellular MembranesIsometric ContractionMuscle ContractionMusclesRana temporariaTime FactorsAcids

Identifiers

PMID8006830
PMCPMC1160399
OpenAlexW2013587579

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.