School of Sport Science, Exercise and Health, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
Eur J Appl Physiol. 2013 Feb;113(2):305-11. doi: 10.1007/s00421-012-2436-3. Epub 2012 Jun 16.
To study the effect of post-exercise cold water immersion (CWI) on core temperature and melatonin responses, 10 male cyclists completed two evening (1800 hours) cycling trials followed by a 15-min CWI (14 °C) or warm water immersion (WWI; 34 °C), and were then monitored for 90 min post-immersion. The exercise trial involved 15 min at 75 % peak power, followed by a 15 min time trial. Core (rectal) temperature was not different between the two conditions pre-exercise (37.4 °C), post-exercise (39 °C) or immediately post-immersion (37.7 °C), but was significantly (p < 0.05) below pre-exercise levels at 60 and 90 min post-immersion in both conditions. Core temperature was significantly lower after CWI than WWI at 30 min (36.84 ± 0.24 vs. 37.42 ± 0.40 °C, p < 0.05) and 90 min (36.64 ± 0.24 vs. 36.95 ± 0.43 °C, p < 0.05) post-immersion. Salivary melatonin levels significantly increased (p < 0.05) from post-exercise (5 pM) to 90 min post-immersion (8.3 pM), but were not different between conditions. At 30 and 90 min post-immersion heart rate was significantly lower (~5-10 bpm, p < 0.01) after CWI than WWI. These results show that undertaking either CWI or WWI post-exercise in the evening lowers core temperature below baseline for at least 90 min; however, the magnitude of decrease is significantly greater following CWI. The usual evening increase in melatonin is unaffected by exercise or post-exercise water immersion undertaken between ~1800 and ~2000 hours.
为了研究运动后冷水浸泡（CWI）对核心温度和褪黑素反应的影响，10 名男性自行车运动员进行了两次夜间（约 1800 小时）骑行试验，随后进行了 15 分钟的 CWI（14°C）或温水浸泡（WWI；34°C），然后在浸泡后 90 分钟进行监测。运动试验包括 15 分钟以 75%的峰值功率进行，随后进行 15 分钟的计时赛。在两种情况下，运动前（37.4°C）、运动后（39°C）或立即浸泡后（37.7°C）核心（直肠）温度没有差异，但在浸泡后 60 和 90 分钟时，两种情况下的核心温度均明显低于运动前水平（p<0.05）。浸泡后 30 分钟（36.84±0.24 比 37.42±0.40°C，p<0.05）和 90 分钟（36.64±0.24 比 36.95±0.43°C，p<0.05）时，CWI 后的核心温度明显低于 WWI。唾液褪黑素水平从运动后（5 pM）到浸泡后 90 分钟（8.3 pM）显著增加（p<0.05），但两种情况之间没有差异。浸泡后 30 和 90 分钟时，CWI 后的心率明显低于 WWI（5-10 bpm，p<0.01）。这些结果表明，晚上进行运动后无论是 CWI 还是 WWI，都会使核心温度在至少 90 分钟内低于基线；然而，CWI 后的降幅明显更大。在晚上1800 至2000 小时之间进行运动或运动后水浸泡不会影响通常的褪黑素夜间增加。
