Evidence map›Paper›PMID 34010359›Full record

ArticlePloS one2021

Hamstrings load bearing in different contraction types and intensities: A shear-wave and B-mode ultrasonographic study.

Pavlos E Evangelidis, Xiyao Shan, Shun Otsuka, Chi Yang, Takaki Yamagishi, Yasuo Kawakami

Open access · goldAbstract read
In one paragraph

Article in PloS one, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.

0numbers the graph read from it
0cells of the map it votes in
15citing papers in PubMed
3.0field-weighted citation impact, top 8% 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

15 citing papers in PubMed, 26 citations in OpenAlex.

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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 2 institutions in 2 countries.

Pavlos E EvangelidisFaculty of Sport Sciences, Waseda University, Tokyo, Japan.ORCID 0000-0002-2612-5173
Xiyao ShanFirst Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.ORCID 0000-0002-0987-2310
Shun OtsukaGraduate School of Sport Sciences, Waseda University, Tokyo, Japan.
Chi YangGraduate School of Sport Sciences, Waseda University, Tokyo, Japan.
Takaki YamagishiFaculty of Sport Sciences, Waseda University, Tokyo, Japan.
Yasuo KawakamiFaculty of Sport Sciences, Waseda University, Tokyo, Japan.ORCID 0000-0003-0588-4039
Waseda University · JPSun Yat-sen University · CN

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The main aim was to examine the load bearing of individual hamstring muscles in different contraction types and intensities, through local stiffness measurement by shear wave elastography (SWE). A secondary aim was to examine the relationship between the SWE stiffness measure and hamstrings morphology. Ten healthy males (age 22.1±4.1 years; height 173.7±5.9 cm; body mass 68.6±12.4 kg; mean ± SD) performed knee flexions on an isokinetic dynamometer at different intensities (20-70%MVC, random order) in three separate, randomized conditions: isometric (ISO), concentric (CON) and eccentric (ECC). SWE was used to measure muscle shear wave velocity (SWV) in biceps femoris long head (BFlh), semitendinosus (ST) and semimembranosus (SM) during contraction. Muscle anatomical cross-sectional area (ACSA) was measured with magnetic resonance imaging and muscle architecture with B-mode ultrasonography. Muscle SWV increased linearly with contraction intensity, but at a varying rate among muscles and contraction types. ST exhibited greater SWV than BFlh and SM in all contraction types, however, there was an upward shift in the SM SWV-torque relationship in ECC compared to ISO and CON. Strong negative correlations were found between peak ISO SWV and ST ACSA (r = -0.81, p = 0.005) and BFlh pennation angle (r = -0.75, p = 0.012). These results suggest that ST has a primary role in hamstrings load bearing in all contraction types, likely due to its morphology; however, there is evidence of increased contribution from SM in eccentric muscle actions.

Indexed as

AdolescentAdultElasticity Imaging TechniquesHamstring MusclesHealthy VolunteersHumansIsometric ContractionMagnetic Resonance ImagingMaleMuscle StrengthTorqueWeight-BearingYoung Adult

Identifiers

PMID34010359
PMCPMC8133428
OpenAlexW3159999145

What OpenQuestion holds

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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.