Evidence map›Paper›PMID 25810385›Full record

ArticleAmerican journal of physiology. Regulatory, integrative and comparative physiology2015

Reduced muscle lengthening during eccentric contractions as a mechanism underpinning the repeated-bout effect.

Wing Yin Lau, Anthony J Blazevich, Michael J Newton, Sam Shi Xuan Wu, Kazunori Nosaka

Open access · greenAbstract read
In one paragraph

Article in American journal of physiology. Regulatory, integrative and comparative physiology, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers.

0numbers the graph read from it
0cells of the map it votes in
16citing papers in PubMed
4.5field-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

16 citing papers in PubMed, 40 citations in OpenAlex.

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  11. The impact of skeletal muscle contraction on CD146American journal of physiology. Cell physiology · 2019
    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

5 authors at 2 institutions in 1 country.

Wing Yin LauSchool of Exercise and Health Sciences, Center for Exercise and Sports Science Research Edith Cowan University, Joondalup, Western Australia, Australia; and.
Anthony J BlazevichSchool of Exercise and Health Sciences, Center for Exercise and Sports Science Research Edith Cowan University, Joondalup, Western Australia, Australia; and.
Michael J NewtonSchool of Psychology and Exercise Science, Murdoch University, Murdoch, Western Australia, Australia.
Sam Shi Xuan WuSchool of Exercise and Health Sciences, Center for Exercise and Sports Science Research Edith Cowan University, Joondalup, Western Australia, Australia; and.
Kazunori NosakaSchool of Exercise and Health Sciences, Center for Exercise and Sports Science Research Edith Cowan University, Joondalup, Western Australia, Australia; and k.nosaka@ecu.edu.au.
Edith Cowan University · AUMurdoch University · AU

Funding

University of Florida Older Americans Independence Center (OAIC)P30AG028740 · NIA · UNIVERSITY OF FLORIDA · PI CHRISTIAAN LEEUWENBURGH · 2007 to 2026
$22.8M
NIA NIH HHS P30 AG028740
6 · The paper itself

Abstract

This study investigated biceps brachii distal myotendinous junction (MTJ) displacement during maximal eccentric elbow flexor contractions to test the hypothesis that muscle length change would be smaller (less MTJ displacement) during the second than the first exercise bout. Ten untrained men performed two eccentric exercise bouts (ECC1 and ECC2) with the same arm consisting of 10 sets of six maximal isokinetic (60°/s) eccentric elbow flexor contractions separated by 4 wk. Biceps brachii distal MTJ displacement was assessed using B-mode ultrasonography, and changes in the displacement (muscle length change) from the start to the end of each contraction during each set and over 10 sets were compared between bouts by two-way repeated-measures ANOVA. Several indirect muscle damage markers were also measured and compared between bouts by two-way repeated-measures ANOVA. The magnitude of MTJ displacement (average of six contractions) increased from set 1 (8.2 ± 4.7 mm) to set 10 (16.4 ± 4.7 mm) during ECC1 (P < 0.05), but no significant changes over sets were evident during ECC2 (set 1: 8.5 ± 4.0 mm; set 10: 9.3 ± 3.1 mm). Changes in maximal voluntary isometric contraction strength, range of motion, muscle thickness, ultrasound echo intensity, serum creatine kinase activity, and muscle soreness (visual analog scale) were smaller (P < 0.05) following ECC2 than ECC1, showing less damage in the repeated bout. These results indicate that the magnitude of muscle lengthening was less during the second than the first eccentric exercise bout, which appears to be a mechanism underpinning the repeated-bout effect.

Indexed as

ExerciseHumansMaleMuscle ContractionMuscle, SkeletalPhysical ExertionRange of Motion, ArticularUltrasonographybiceps brachiiB-mode ultrasounddelayed-onset muscle sorenessmuscle strengthmyotendinous junctionrepeated-bout effect

Identifiers

PMID25810385
PMCPMC6195649
OpenAlexW2035522546

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.