Department of Physiology, School of Medicine, Trinity College Dublin, The University of Dublin, Ireland.
Department of Physiology, School of Medicine, Trinity College Dublin, The University of Dublin, Ireland.
J Sci Med Sport. 2019 Dec;22(12):1349-1354. doi: 10.1016/j.jsams.2019.07.002. Epub 2019 Jul 11.
We investigated if cold water immersion (CWI) affects exercise performance during a prolonged intermittent sprint test (IST), designed to mimic activity patterns of team-sports.
Randomized-crossover design.
Ten male team-sport players completed 3 IST protocols (two 40-min "halves" of repeated 2-min blocks consisting of a 8-s "all-out" sprint, 100-s active recovery and 12-s rest) on a cycle ergometer at normothermic conditions. Each "half" was separated by a 15 min recovery period of either: (i) passive rest, (ii) 5-min CWI at 8 °C (CWI-5) or (iii) 2.5-min CWI at 8 °C (CWI-2.5), in a random counterbalanced order.
Physical performance, core temperature (T) and heart rate were not different among conditions in the first half. In the passive rest trial, total work (TW) and peak power (PP) were lower during the second half (TW: 5.04 ± 1.11 kJ; PP: 929 ± 286 W) than the first half (TW: 5.66 ± 1.02 kJ; PP: 1009 ± 266 W); while TW and PP were not different between halves following CWI-5 (first half, TW: 5.34 ± 1.02 kJ, PP: 1016 ± 283 W; second half, TW: 5.19 ± 1.38 kJ; PP: 996 ± 318 W) and CWI-2.5 (first half, TW: 5.47 ± 1.19 kJ, PP: 966 ± 261 W; second half, TW: 5.25 ± 1.17 kJ; PP: 952 ± 231 W). T was lower until the 20 minute of the second half after CWI-5 and CWI-2.5 compared with passive rest.
A post-exercise 2.5-5-min CWI attenuates the reductions in prolonged sprint performance that occur in the second half of team sports, due, at least partly, to reductions in core temperature and associated increase in heat storage.
我们研究了冷水浸泡（CWI）是否会影响模拟团队运动活动模式的长时间间歇冲刺测试（IST）期间的运动表现。
随机交叉设计。
10 名男性团队运动运动员在恒温条件下在自行车测力计上完成了 3 个 IST 方案（两个 40 分钟的“半程”，由 2 分钟的块组成，每个块包含 8 秒的“全力以赴”冲刺、100 秒的主动恢复和 12 秒的休息）。每个“半程”之间通过 15 分钟的恢复期分开：（i）被动休息，（ii）8°C 的 5 分钟 CWI（CWI-5）或（iii）8°C 的 2.5 分钟 CWI（CWI-2.5），以随机平衡的顺序。
在前半段，条件之间的身体表现、核心温度（T）和心率没有差异。在被动休息试验中，第二次半程的总工作量（TW）和峰值功率（PP）低于前半程（TW：5.04±1.11 kJ；PP：929±286 W）；而 CWI-5 和 CWI-2.5 后两次半程的 TW 和 PP 没有差异（第一次半程，TW：5.34±1.02 kJ，PP：1009±266 W；第二次半程，TW：5.19±1.38 kJ；PP：996±318 W）和 CWI-2.5（第一次半程，TW：5.47±1.19 kJ，PP：966±261 W；第二次半程，TW：5.25±1.17 kJ；PP：952±231 W）。与被动休息相比，CWI-5 和 CWI-2.5 后第二次半程的 T 直到第 20 分钟才下降。
运动后 2.5-5 分钟的 CWI 减轻了团队运动后半程长时间冲刺表现的下降，这至少部分归因于核心温度的降低和相关的热量储存增加。
