Human Performance Research Group, College of Health and Sport Science, Santa Catarina State University, Florianópolis, Brazil ; and.
Aquatic Biomechanics Research Laboratory, College of Health and Sport Science, Santa Catarina State University, Florianópolis, Brazil.
J Strength Cond Res. 2021 Mar 1;35(3):819-825. doi: 10.1519/JSC.0000000000002794.
Lisbôa, FD, Raimundo, JAG, Pereira, GS, Ribeiro, G, de Aguiar, RA, and Caputo, F. Effects of time of day on race splits, kinematics, and blood lactate during a 50-m front crawl performance. J Strength Cond Res 35(3): 819-825, 2021-This study aimed to investigate the performance, race splits, metabolic, and stroke parameters during 2 successive 50-m front crawl under conditions simulating a competition. Eleven competitive male swimmers (20 ± 3 years, 182 ± 5 cm, and 77 ± 5 kg) performed 2 successive 50-m front crawl trials in a 50-m swimming pool at 10 am and 5 pm. Block time (tB), 15-m performance (t.15-m), and 50-m performance (t.50-m) were measured. Velocity (V), stroke rate (SR), stroke length (SL), and stroke index (SI) were measured at 3 time points during the trials. Pre-trial and post-trial blood samples were taken to determine blood lactate accumulation (Δ[Lac]). For t.50-m, the relative difference between 10 am and 5 pm reached 0.1% (p = 0.7; effect size [ES] = 0.02). Furthermore, no differences in tB (p = 0.12; ES = -0.28) and t.15-m (p = 0.39; ES = -0.16) were observed between periods. Both V (p = 0.11; ES = -0.14) and SI (p = 0.16; ES = 0.15) were also similar. Higher values of SR were recorded at 10 am (p = 0.03; ES = -0.32), whereas the morning values of SL were lower (p = 0.04; ES = 0.3). Δ[Lac] was not significantly different between periods (p = 0.07; ES = -0.27). Although time of the day did not impact performance in 2 successive 50-m front crawl performances, different stroke parameters profiles were observed during these trials. This may help coaches design specific warm-up exercises to enhance performance at different times of the day.
利斯博阿，FD，雷蒙多，JAG，佩雷拉，GS，里贝罗，G，德阿吉亚尔，RA，卡普托，F。时间对 50 米爬泳比赛分段、运动学和血乳酸的影响。J 力量与调理研究 35（3）：819-825，2021-本研究旨在探讨 2 次连续 50 米爬泳在模拟比赛条件下的表现、分段、代谢和划水参数。11 名有竞争力的男性游泳运动员（20±3 岁，182±5cm，77±5kg）在 10 点和 5 点在 50m 游泳池中进行了 2 次连续的 50m 爬泳试验。测量了总时间（tB）、15m 成绩（t.15-m）和 50m 成绩（t.50-m）。在试验过程中的 3 个时间点测量速度（V）、划频（SR）、划长（SL）和划水指数（SI）。试验前和试验后采血样测定血乳酸积累（Δ[Lac]）。对于 t.50-m，上午 10 点和下午 5 点的相对差异达到 0.1%（p=0.7；效应量[ES]=0.02）。此外，两个时段的 tB（p=0.12；ES=-0.28）和 t.15-m（p=0.39；ES=-0.16）没有差异。速度（p=0.11；ES=-0.14）和划水指数（p=0.16；ES=0.15）也相似。上午 10 点的划频较高（p=0.03；ES=-0.32），而上午的划长较低（p=0.04；ES=0.3）。两个时段的 Δ[Lac]无显著性差异（p=0.07；ES=-0.27）。尽管时间对 2 次连续 50m 爬泳成绩没有影响，但在这些试验中观察到了不同的划水参数特征。这可能有助于教练设计特定的热身练习，以提高在不同时间的表现。
