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- W2890856923 abstract "Objetivo: O objetivo do presente estudo foi analisar o efeito agudo de um exercicio de duas horas de ciclismo envolvendo sprints repetidos sobre a perda de forca muscular e sobre as concentracoes sericas de creatina quinase (CK) e lactato desidrogenase (LDH). A amostra foi constituida por nove ciclistas competitivos do sexo masculino (idade: 25,8 ± 3,4 anos; VO 2 max: 63,7 ± 6,7 ml·kg -1 ·min -1 ). Para determinar as concentracoes plasmaticas de CK e LDH foram coletados 5 ml de sangue da veia cubital do braco dos sujeitos antes e imediatamente apos a realizacao de duas horas de ciclismo envolvendo 8 sprints de 15 s de duracao. Antes e apos o teste de ciclismo tambem foram analisadas contracoes isometricas voluntarias maximas. Resultados e discussao: Foram observados aumentos significativos (p<0,05) nas concentracoes plasmaticas de CK (~48%) e LDH (~11%) comparados aos valores basais. Alem disso, ocorreu uma reducao significativa (~13%) na producao de forca dos musculos extensores do joelho. Conclusao: O presente estudo demonstrou que um protocolo simulando o aspecto intermitente do ciclismo, com duas horas de duracao, provocou reducao de forca muscular, juntamente com alteracoes agudas nas concentracoes sericas de CK e LDH e forca muscular, indicando a ocorrencia de dano muscular. ABSTRACT Muscle damage markers after endurance cycling with multiple sprints Objective: The aim of this study was to analyze the acute effect of a 2-hours cycling exercise involving repeated sprints in strength loss and serum concentrations of creatine kinase (CK) and lactate dehydrogenase (LDH). The sample consisted on nine competitive male cyclists (age: 25.8 ± 3.4 years, VO 2 max: 63.7 ± 6.7 ml·kg -1 ·min -1 ). To determine the concentrations of CK and LDH it was collected 5 ml of blood from the cubital vein in the arm of the subjects before and immediately after performed 2-hours of cycling involving 8 sprints with 15-s of duration. Before and after the cycling test it was analyzed maximal voluntary isometric contractions. Results and discussion: It was observed a significant increase (p<0.05) in plasma concentrations of CK (~48%) and LDH (~11%) compared to pre cycling condition. Furthermore, there was a significant reduction (~13%) in force production of the knee extensor muscles. Conclusion: The present study demonstrated that a specific protocol in cycling of two hour of duration trigger acute changes in serum CK and LDH indicating the occurrence of muscle damage." @default.
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- W2890856923 date "2018-08-11" @default.
- W2890856923 modified "2023-09-23" @default.
- W2890856923 title "Marcadores de dano muscular após ciclismo prolongado envolvendo múltiplos sprints" @default.
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