Lazarim Fernanda L, Antunes-Neto Joaquim M F, da Silva Fernando O C, Nunes Lázaro A S, Bassini-Cameron Adriana, Cameron Luiz-Cláudio, Alves Armindo A, Brenzikofer René, de Macedo Denise Vaz
Instituto de Biologia, Unicamp, 13083-970 Campinas, Sao Paulo, Brazil.
J Sci Med Sport. 2009 Jan;12(1):85-90. doi: 10.1016/j.jsams.2007.10.004. Epub 2008 Feb 20.
The current schedule of the Brazilian Soccer Championship may not give players enough recovery time between games. This could increase the chances of muscle damage and impaired performance. We hypothesized that plasma creatine kinase (CK) activity could be a reliable indirect marker of muscle overload in soccer players, so we sought to identify the reference values for upper limits of CK activity during a real-life elite competition. This study analyzed changes in plasma CK activity in 128 professional soccer players at different times during the Brazilian Championship. The upper limits of the 97.5th and 90th percentiles determined for CK activity were 1.338U/L and 975U/L, respectively, markedly higher than values previously reported in the literature. We also evaluated a team monthly throughout the Championship. The upper limit of the 90th percentile, 975U/L, was taken as the decision limit. Six players showing plasma CK values higher than this were asked to decrease their training for 1 week. These players presented lower CK values afterwards. Only one player with a CK value higher than the decision limit (1800U/L 1 day before a game) played on the field and was unfortunately injured during the game. The CK activity in all the other players showed a significant decrease over the course of the Championship, and the values became more homogeneous at the end. The results presented here suggest that plasma CK upper limit values can be used as a practical alternative for early detection of muscle overload in competing soccer players.
巴西足球锦标赛目前的赛程安排可能无法让球员在比赛之间获得足够的恢复时间。这可能会增加肌肉损伤和表现受损的几率。我们假设血浆肌酸激酶（CK）活性可能是足球运动员肌肉超负荷的可靠间接指标，因此我们试图确定在现实生活中的精英比赛期间CK活性上限的参考值。本研究分析了128名职业足球运动员在巴西锦标赛不同时间点的血浆CK活性变化。CK活性的第97.5百分位数和第90百分位数的上限分别为1.338U/L和975U/L，明显高于先前文献报道的值。我们还在整个锦标赛期间对一支球队进行了月度评估。将第90百分位数的上限975U/L作为判定界限。六名血浆CK值高于此界限的球员被要求减少训练一周。之后这些球员的CK值降低。只有一名CK值高于判定界限（比赛前一天为1800U/L）的球员上场比赛，不幸的是在比赛中受伤。在锦标赛过程中，所有其他球员的CK活性均显著下降，并且在最后变得更加均匀。此处呈现的结果表明，血浆CK上限值可作为早期检测参赛足球运动员肌肉超负荷的实用替代指标。
