Individual analysis of creatine kinase concentration in Brazilian elite soccer players

Abstract

Objective: to determine the individual profile of blood concentration of creatine kinase (CK) in elite soccer players as well as to analyze the CK concentrations in different periods during the Professional Brazilian Championship. Methods: resting CK of 17 soccer players was evaluated before the competition (pre-season) and after the matches (36 and 46 hours after the games) (CK Game ) for the individual blood CK. The Chi-square test was used to analyze the individual CK during the season. The competitive season was divided into three periods: initial, intermediate and final. The one-way ANOVA with repeated measurements followed by post hoc Student-Newman-Keuls test was used to compare the individual CK of each soccer player in each competitive period. The significance level was set at p<0.05. Results: the highest frequency of individual CK was found in the second quartile (71 observations) and the lowest frequency in the first (26 observations) and the fourth quartile (40 observations) compared to the expected number of 45.8 (x 2 =22.21). CK concentrations were lower in the intermediate (mean=66.99%) and final (mean=60.21%) periods than in the initial period (mean=89.33%). Conclusion: soccer players did not show elevated muscle damage and probably a muscle adaptation occurred in the competition, due to the reduction of CK concentrations observed.Keywords: soccer, muscle strength, creatine/blood. RESUMO

Relationships between Training Loads and Selected Blood Parameters in Professional Soccer Players during a 12-Day Sports Camp

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Comparison of different ways of expressing creatine kinase concentration of soccer players during a competitive season

“…Values are showed as mean and standard deviation. Furthermore, the statistic power (ω) of analysis of variance and Partial Eta Squared (η 2 p ) to demonstrate the magnitude of the differences between each measure (small < .01, mean = .06, extensive> .14) 31 were calculated. The significance level was set at α < .05.…”

The Role of Veracity on the Load Monitoring of Professional Soccer Players: A Systematic Review in the Face of the Big Data Era

“…This paradox of a similar aerobic fitness between decades, despite objectively increased match demands, highlights the need to select appropriate monitoring tools. Furthermore, considering that soccer is a complex sport in which players need to develop several physical capacities (e.g., acceleration, agility, endurance), the selection of the best tools to monitor the evolution of players' physical fitness over the season is required for better managing the complex balance between training, competition, recovery, and evaluation [7][8][9][10].…”