Henderson Mitchell J, Chrismas Bryna C R, Stevens Christopher J, Coutts Aaron J, Taylor Lee
Int J Sports Physiol Perform. 2020 Feb 5;15(4):571-580. doi: 10.1123/ijspp.2019-0375. Print 2020 Apr 1.
To characterize player core temperature (Tc) across a World Rugby Women's Sevens Series tournament day (WRWSS) and determine the efficacy of commonly employed cold-water-immersion (CWI) protocols.
Tc was measured in 12 elite female rugby sevens athletes across 3 games (G1-3) from day 1 of the Sydney WRWSS tournament. Symptoms of exertional heat illness, perceptual scales, CWI details, playing minutes, external-load data (measured by global positioning systems), and wet-bulb globe temperature (range 18.5°C-20.1°C) were also collected. Linear mixed models and magnitude-based inferences were used to assess differences in Tc between periods (G1-3 and warm-ups [WU]).
Average Tc was "very likely" lower (effect size; ±90% confidence limit -0.33; ±0.18) in G1 than in G2. Peak Tc was "very likely" (0.71; ±0.28) associated with increased playing time. CWI did not remove the accumulated Tc due to WU and match-play activity (∼1°C-2°C rise in Tc still present compared with Tc at WU onset for players ≥6-min match play).
Elite WRWSS athletes experienced high Tc during WU (Tc peak 37.9-39.0°C) and matches (Tc peak 37.9-39.8°C), a magnitude known to reduce intermittent high-intensity physical performance (≥39°C). The CWI protocol resulted in players (≥6-min match play) with ∼1°C to 2°C raised Tc compared with Tc at WU onset.
描述世界橄榄球女子七人制系列赛比赛日（WRWSS）期间运动员的核心体温（Tc），并确定常用冷水浸泡（CWI）方案的效果。
在悉尼WRWSS比赛日第1天的3场比赛（G1 - 3）中，对12名精英女子橄榄球七人制运动员的Tc进行测量。还收集了运动性热疾病症状、感知量表、CWI细节、比赛时长、外部负荷数据（通过全球定位系统测量）以及湿球黑球温度（范围18.5°C - 20.1°C）。使用线性混合模型和基于量级的推断来评估各时段（G1 - 3和热身[WU]）之间Tc的差异。
G1期间的平均Tc“极有可能”低于G2（效应量；±90%置信区间 -0.33；±0.18）。峰值Tc“极有可能”（0.71；±0.28）与比赛时长增加相关。CWI未能消除由于热身和比赛活动导致的Tc累积（与热身开始时相比，比赛时长≥6分钟的运动员的Tc仍有大约1°C - 2°C的升高）。
精英WRWSS运动员在热身（Tc峰值37.9 - 39.0°C）和比赛（Tc峰值37.9 - 39.8°C）期间经历高温，已知该量级会降低间歇性高强度身体表现（≥39°C）。与热身开始时相比，CWI方案导致运动员（比赛时长≥6分钟）Tc升高约1°C至2°C。
