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http://hdl.handle.net/1843/56759| Type: | Artigo de Periódico |
| Title: | The effects of altering the concentric/eccentric phase times on EMG response, lactate accumulation and work completed when training to failure |
| Authors: | Gustavo Ferreira Pedrosa Sandra Carvalho Machado Rodrigo Cesar Ribeiro Diniz Lucas Túlio Hugo César Martins Costa Andre Gustavo Pereira Andrade Michael Bemben Mauro Heleno Chagas Fernando Vitor Lima |
| 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. |
| Subject: | Fisiologia Treinamento de Força Fadiga |
| language: | eng |
| metadata.dc.publisher.country: | Brasil |
| Publisher: | Universidade Federal de Minas Gerais |
| Publisher Initials: | UFMG |
| metadata.dc.publisher.department: | EEF - DEPARTAMENTO DE ESPORTES EEFFTO - ESCOLA DE EDUCAÇÃO FISICA, FISIOTERAPIA E TERAPIA OCUPACIONAL |
| Rights: | Acesso Aberto |
| metadata.dc.identifier.doi: | https://doi.org/10.2478/hukin-2019-0132 |
| URI: | http://hdl.handle.net/1843/56759 |
| Issue Date: | 20-Jul-2020 |
| metadata.dc.url.externa: | https://sciendo.com/article/10.2478/hukin-2019-0132 |
| metadata.dc.relation.ispartof: | Journal of Human Kinetics |
| Appears in Collections: | Artigo de Periódico |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| The Effects of Altering the Concentric_Eccentric Phase Times on EMG Response, Lactate Accumulation and Work Completed when Training to Failure.pdf | 5.35 MB | Adobe PDF | View/Open |
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