Evidence map›Paper›PMID 33249658›Full record

ArticleScandinavian journal of medicine & science in sports2021

Muscle length influence on rectus femoris damage and protective effect in knee extensor eccentric exercise.

Ryoichi Ema, Kazunori Nosaka, Ryosuke Kawashima, Akihiro Kanda, Koya Ikeda, Ryota Akagi

Open access · hybridAbstract read
In one paragraph

Article in Scandinavian journal of medicine & science in sports, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers.

0numbers the graph read from it
0cells of the map it votes in
17citing papers in PubMed
1.6field-weighted citation impact, top 18% 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

17 citing papers in PubMed, 21 citations in OpenAlex.

  1. Trial
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  7. Skeletal muscle elastic modulus in marathon distance runners.European journal of applied physiology · 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

6 authors at 3 institutions in 2 countries.

Ryoichi EmaSchool of Management, Shizuoka Sangyo University, Iwata, Japan.ORCID https://orcid.org/0000-0002-6206-1752
Kazunori NosakaSchool of Medical and Health Sciences, Centre for Exercise and Sports Science Research, Edith Cowan University, Joondalup, WA, Australia.ORCID https://orcid.org/0000-0001-7373-4994
Ryosuke KawashimaCollege of Systems Engineering and Science, Shibaura Institute of Technology, Saitama, Japan.
Akihiro KandaGraduate School of Engineering and Science, Shibaura Institute of Technology, Saitama, Japan.
Koya IkedaCollege of Systems Engineering and Science, Shibaura Institute of Technology, Saitama, Japan.
Ryota AkagiCollege of Systems Engineering and Science, Shibaura Institute of Technology, Saitama, Japan.
Shibaura Institute of Technology · JPEdith Cowan University · AUShizuoka Sangyo University · JP

Funding

Japan Society for the Promotion of Science JP16K01671
6 · The paper itself

Abstract

This study tested the hypothesis that the magnitude of rectus femoris (RF) damage and the repeated bout effect (RBE) would be greater after knee extensor eccentric exercise performed in a supine (long RF lengths) than a sitting (short RF lengths) position, and the muscle length effects would be more prominent at the proximal than distal RF. Young untrained men were placed to one of the two groups (n = 14 per group). S group performed the knee extensor eccentric exercise in the sitting position for the first bout and the supine position for the second bout, and L group performed the exercise in the supine position for two bouts, with 4 weeks between bouts. Dependent variables included evoked and maximal voluntary isometric contraction (MVC) torque, electromyography (EMG) during MVC, muscle soreness, and shear modulus, which were measured before and 1-3 days after each exercise bout. After the first bout, L group in comparison with S group showed greater (P < .05) changes in hip flexor MVC torque (average of 1-3 days post-exercise: -11.1 ± 9.4% vs -5.0 ± 7.5%), proximal RF EMG (-22.4 ± 16% vs -9.0 ± 21.9%), and proximal RF shear modulus (33.2 ± 22.8% vs 16.9 ± 13.5%). No significant differences between groups were evident for any of other variables after the first bout including knee extensor MVC torque, and for the changes in all variables after the second bout. These results supported the hypothesis that RF damage would be greater for the spine than sitting position especially at the proximal region, but did not support the hypothesis about the RBE.

Indexed as

Sitting PositionElastic ModulusElectromyographyExerciseHumansIsometric ContractionKneeMaleMuscle StrengthMyalgiaQuadriceps MuscleSupine PositionTorqueYoung Adulthip flexionmaximal voluntary contractionmuscle sorenessrepeated bout effectshear modulus

Identifiers

PMID33249658
PMCPMC7986188
OpenAlexW3110388096

What OpenQuestion holds

Textmetadata
LicenceCC BY
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.