Laboratory of Exercise Physiology, University of Saint-Etienne, PRES Lyon, France.
J Strength Cond Res. 2011 Jul;25(7):1918-24. doi: 10.1519/JSC.0b013e3181e075a3.
When testing the ability of sportsmen to repeat maximal intensity efforts, or when designing specific training exercises to improve it, fatigue during repeated sprints is usually investigated through a number of sprints identical for all subjects, which induces a high intersubject variability in performance decrement in a typical heterogeneous group of athletes (e.g., team sport group, students, and research protocol volunteers). Our aim was to quantify the amplitude of the reduction in this variability when individualizing the sprint dose, that is, when requiring subjects to perform the number of sprints necessary to reach a target level of performance decrement. Fifteen healthy men performed 6-second sprints on a cycle ergometer with 24 seconds of rest until exhaustion or until 20 repetitions in case no failure occurred. Peak power output (PPO) was measured and a fatigue index (FI) computed. The variability in PPO decrement was compared between the 10th sprint and the sprint at which subject reached the target FI of 10%. Individual FI values after the 10th sprint were 14.6 ± 6.9 vs. 11.1 ± 1.2%, when individualizing the sprint dose, which corresponded to coefficients of interindividual variability of ∼47.3 and ∼10.8%, respectively. Individualizing the sprint dose substantially reduced intersubject variability in performance decrement, enabling a more standardized state of fatigue in repeated-sprints protocols designed to induce fatigue and test or train this specific repeated-sprint ability in a heterogeneous group of athletes. A direct feedback on the values of performance parameters is necessary between each sprint for the experimenter to set this individualized sprint dose.
当测试运动员重复最大强度努力的能力，或者设计专门的训练练习来提高这种能力时，通常通过对所有受试者都相同的一系列短跑来测试重复短跑时的疲劳，这会导致典型异质运动员群体（例如，团队运动组、学生和研究方案志愿者）的表现下降的个体间变异性很高。我们的目的是量化个性化短跑剂量时这种变异性的降低幅度，也就是说，当要求受试者完成达到目标表现下降水平所需的短跑次数时。15 名健康男性在自行车测力计上进行 6 秒短跑，休息 24 秒，直到力竭或达到 20 次重复，如果没有失败发生。测量峰值功率输出（PPO）并计算疲劳指数（FI）。比较第 10 次短跑和达到目标 FI 为 10%的短跑时的 PPO 下降变异性。个性化短跑剂量后第 10 次短跑的个体 FI 值分别为 14.6±6.9%和 11.1±1.2%，个体间变异性系数分别约为 47.3%和 10.8%。个性化短跑剂量大大降低了表现下降的个体间变异性，使重复短跑协议中诱导疲劳并测试或训练这种特定重复短跑能力的疲劳状态更加标准化，在这种重复短跑协议中，运动员群体是异质的。实验者需要在每次短跑之间提供有关性能参数值的直接反馈，以便设置个性化短跑剂量。
