Exercise and Sport Performance Laboratory, Texas Christian University, Fort Worth, Texas.
Exercise and Sport Science, University of Wisconsin-La Crosse, La Crosse, Wisconsin.
J Strength Cond Res. 2019 Sep;33(9):2481-2487. doi: 10.1519/JSC.0000000000001920.
Stone, JD, Kreutzer, A, Mata, JD, Nystrom, MG, Jagim, AR, Jones, MT, and Oliver, JM. Changes in creatine kinase and hormones over the course of an American Football Season. J Strength Cond Res 33(9): 2481-2487, 2019-The purpose of this study was to examine changes in creatine kinase and hormones over the course of an entire season of American football. A secondary purpose was to determine differences between starters and nonstarters. Fasting blood samples were obtained from 19 National Collegiate Athletic Association Division I (n = 19; 20 ± 1 years) football athletes over the course of a season beginning before the start of summer off-season conditioning (T1), before (T2) and after preseason (T3) football camp, with remaining samples taken throughout the competitive season (T4-T8). A magnitude-based inference approach was used to define outcomes. Testosterone was higher in starters before the start of the season (T1, Effect Size [ES] = 0.8) and during preconference (T4; ES = 0.7). Postcamp (T3) testosterone was lower in all players, though greater in starters (starters, 0.0%/0.3%/99.7%; nonstarters, 0.2%/2.9%/96.9%). An increase cortisol relative to baseline (T1) was observed in starters early in season (T4, ES = 0.7; T5, ES = 0.5). Creatine kinase was elevated at all time points in all athletes, with starters having higher circulating levels throughout season. These data demonstrate that changes in hormonal markers may be experienced over a season of football and differ by playing status. Differences between starters and nonstarters may be indicative of greater damage and stress experienced by starters, which may result from a greater number of repetitions.
斯通、克里策、马塔、奈斯特罗姆、贾吉姆、琼斯和奥利弗。美式足球赛季中肌酸激酶和激素的变化。《力量与调节研究杂志》33（9）：2481-2487，2019.本研究旨在探讨整个美式足球赛季中肌酸激酶和激素的变化。次要目的是确定首发球员和非首发球员之间的差异。在整个赛季（T4-T8）的剩余时间里，从 19 名美国大学生体育协会一级（n = 19；20 ± 1 岁）足球运动员身上采集了空腹血样，时间从夏季休赛期体能训练前（T1）开始，到季前训练营前（T2）和季前训练营后（T3），以及整个比赛赛季。使用基于幅度的推理方法来定义结果。在赛季开始前（T1）和会前（T4），首发球员的睾丸激素水平较高（效应大小[ES] = 0.8）。在所有球员中，T3 时的睾丸激素水平较低，但首发球员中降幅更大（首发球员，0.0%/0.3%/99.7%；非首发球员，0.2%/2.9%/96.9%）。在赛季早期（T4，ES = 0.7；T5，ES = 0.5），首发球员的皮质醇相对基线（T1）有所增加。在所有运动员中，肌酸激酶在所有时间点均升高，首发球员在整个赛季的循环水平均较高。这些数据表明，在足球赛季中，荷尔蒙标志物的变化可能会发生，并且因比赛状态而异。首发球员和非首发球员之间的差异可能表明首发球员经历了更大的损伤和压力，这可能是由于重复次数较多所致。
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