Evidence map›Paper›PMID 32774535›Full record

ArticleJournal of human kinetics2020

The Effects of Altering the Concentric/Eccentric Phase Times on EMG Response, Lactate Accumulation and Work Completed When Training to Failure.

Gustavo Ferreira Pedrosa, Sandra Carvalho Machado, Rodrigo César Ribeiro Diniz, Lucas Túlio de Lacerda, Hugo Cesar Martins-Costa, André Gustavo Pereira de Andrade, Michael Bemben, Mauro Heleno Chagas, Fernando Vitor Lima

Open access · diamondAbstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in Journal of human kinetics, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

0numbers the graph read from it
0cells of the map it votes in
0citing papers in PubMed
0.4field-weighted citation impact, top 43% 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

0 citing papers in PubMed, 4 citations in OpenAlex.

No citing paper in PubMed yet.

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

9 authors at 4 institutions in 2 countries.

Gustavo Ferreira PedrosaWeight Training Laboratory, School of Physical Education, Physiotherapy and Occupational Therapy of the Federal University of Minas Gerais, Belo Horizonte, Brazil.
Sandra Carvalho MachadoWeight Training Laboratory, School of Physical Education, Physiotherapy and Occupational Therapy of the Federal University of Minas Gerais, Belo Horizonte, Brazil.
Rodrigo César Ribeiro DinizWeight Training Laboratory, School of Physical Education, Physiotherapy and Occupational Therapy of the Federal University of Minas Gerais, Belo Horizonte, Brazil.
Lucas Túlio de LacerdaWeight Training Laboratory, School of Physical Education, Physiotherapy and Occupational Therapy of the Federal University of Minas Gerais, Belo Horizonte, Brazil.
Hugo Cesar Martins-CostaWeight Training Laboratory, School of Physical Education, Physiotherapy and Occupational Therapy of the Federal University of Minas Gerais, Belo Horizonte, Brazil.
André Gustavo Pereira de AndradeBiomechanical Laboratory of Physical Education, Physiotherapy and Occupational Therapy of the Federal University of Minas Gerais, Belo Horizonte, Brazil.
Michael BembenDepartment of Health and Exercise Science. University of Oklahoma, Norman, United States.
Mauro Heleno ChagasWeight Training Laboratory, School of Physical Education, Physiotherapy and Occupational Therapy of the Federal University of Minas Gerais, Belo Horizonte, Brazil.
Fernando Vitor LimaWeight Training Laboratory, School of Physical Education, Physiotherapy and Occupational Therapy of the Federal University of Minas Gerais, Belo Horizonte, Brazil.
Universidade Federal de Minas Gerais · BRInstituto Tecnológico de Aeronáutica · BRPontifícia Universidade Católica de Minas Gerais · BRUniversity of Oklahoma · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

This study compared the electromyographic response, the blood lactate concentration (BLC), and the maximum number of repetitions (MNR) between protocols of different concentric/eccentric duration taken to muscle failure. This comparison may help to understand how different concentric/eccentric duration may influence performance and the central and metabolic responses in trained men. Seventeen strength-trained men performed two protocols in a counterbalanced design. Three sets of the Smith bench press exercise were performed to failure at 60% of the one-repetition maximum (1RM) using each protocol (4-s concentric/2-s eccentric [4 s: 2 s]; and 2-s concentric/4-s eccentric [2 s: 4 s]). The normalized root mean square (EMGRMS) and the mean frequency (EMGMF) of the electromyographic signals for the pectoralis major and the triceps brachii were compared in the first, middle, and last repetitions. The BLC was assessed at rest, during and after the test sessions. To compare the EMG and BLC, a 3-way ANOVA with repeated measures with a post hoc Tukey's test was used. To compare the MNR performed across the sets, an ANOVA-type rank test with the Dunn's post hoc test was used. The ANOVA indicated a greater EMGRMS for Protocol 4 s: 2 s in the pectoralis major and a lower EMGMF for Protocol 4 s: 2 s in the triceps brachii at the middle and last repetitions. Both protocols increased the EMGRMS and decreased the EMGMF across repetitions. Despite the results show different levels of activation and neuromuscular fatigue between protocols, the BLC and the MNR were similar.

Indexed as

bench presscentral fatigueelectromyographyphysiologystrength

Identifiers

PMID32774535
PMCPMC7386151
OpenAlexW3045196124

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
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.