“When you use water to cool your skin, your body can send blood back to important areas like your stomach and your intestines, so you can handle hydration and nutrients better. Then your fatigue will be less later on.” explains Casa.

卡萨解释道：“当你用水来给皮肤降温时，你的身体会把血流送到胃肠等重要区域，从而能让你更好地补充水分和营养。然后你的疲劳感就会减少。”

That exposure to cold water also causes vasoconstriction, which is when your blood vessels become more narrow and, along with the heart, need to work harder to continue moving blood flow, says Aaron Drogoszewski, a NASM-certified personal trainer. “This increased demand strengthens the heart and blood vessels, translating to improved circulation longer term,” he explains. “Improved circulation benefits overall health, performance, and recovery by helping to deliver key nutrients and energy to muscles and organs while simultaneously removing exercise-related metabolic waste products such as lactic acid more efficiently.”

海军航空医学院认证的私人教练阿伦·德若果斯邱斯基说，接触冷水还会造成血管收缩，也就是血管变细，血管和心脏都要更努力地继续让血液流动。他解释道：“这种更高的需求会增强心脏和血管，长期来看会改善血流。血流改善有助于将重要营养物质和能量输送到肌肉和器官，同时还能更有效地将乳酸等与锻炼相关的新陈代谢废物排掉，对整体健康、运动表现和恢复情况都有益。”

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