| Summary: | === The purpose of the present study was to perform individualized analyses of the blood creatine kinase (CK) concentrations of professional first division Soccer players during a Brazilian championship. Resting CK of 17 players was essayed before the competition (beginning of the season) and following the matches (36 and 46 hours post-games) (CKGame). The higher value of CK (CKMax) during the competition and
the CK baseline values (CKBas) were used for the analysis of the individual CK. The competitive calendar was divided into three periods: the initial, the intermediate and the final. The difference between CKMax and CKBas (CKMax) was considered 100% and the calendar was divided into quartiles for frequency analyses of the observations of the measurements in each quartile on the difference between CKGame
e CKBas (%CKGame) using the Chi-square test. The one-way ANOVA with repeated measurements followed by the post hoc student-Newman-Keuls was used to compare the highest percentage of each competitive period. The adopted level of significance was p<0.05. A higher frequency of %CKGame was found on the second quartile (71 observations) and lower frequencies on the 1st (26 observations) and 4th
quartile (40 observations) than expected number of 45.8 (x2 = 22.21). CK was lower on the intermediate (mean 66.99%) and final (mean 60.21%) periods than initial (mean 89.33%). The soccer players did not show an elevated muscle stress (3° and 4° quartile), and that could be related with the decrease of CK during the competition. === O objetivo deste estudo foi analisar de forma individualizada as concentracoescsanguineas de Creatina quinase (CK) durante um campeonato brasileiro de futebolcda primeira divisao. A [CK] de repouso de 17 jogadores profissionais de futebol foicavaliada antes da competicao (inicio da pre-temporda) e apos os jogos (36 e 46hc apos jogos) (CKJogo). O maior valor da [CK] (CKMax) durante a competicao e a [CK] de repouso (CKRep) foi utilizado para analise individualizada da [CK]. O calendario competitivo foi dividido em tres periodos: os dois primeiros meses (Inicial); terceiro mes (Intermediario) e quarto e quinto mes (Final). A diferenca entre CKMax e CKRep (CKMax) foi considerada 100% e dividida em quartis para analise das frequencias de observacoes em cada quartil das medidas da diferenca entre a CKJogo e CKRep (%CKJogo) atraves do teste de Chi-quadrado. A ANOVA one-way com medidas repetidas seguido pelo post hoc student-Newman-Keuls foi utilizada para comparar a maior diferenca percentual de cada periodo competitivo. O nivel de significancia
adotado foi de p<0,05. Foi encontrado maior frequencia do %CKJogo no 2° quartil (71 observacoes) e menores frequencias no 1° (26 observacoes) e 4° quartis (40 observacoes) comparado com esperado de 45,8 (X 2 = 22,21). A [CK] foi menor no periodo Intermediario (media 66.99%) e Final (media 60.21%) periodos comparados com o Inicial (media 89.33%). Os atletas nao apresentaram um estado de microlesoes elevado (3° e 4° quartis), o que pode estar relacionado com a diminuicao da [CK] durante a competicao.
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