Do you really know｜为什么运动后不宜立即洗澡？
英音听力｜BBC & 经济学人等
Why should I avoid showering after a workout?
After an intense and sweaty workout, the first thing most of us want to do is jump into the shower to relax our muscles and wash off the sweat. However, that's not actually the best idea. Showering too soon after a workout can have harmful effects on our health.
Really? Like what?
When you work up a sweat, your heart rate accelerates and blood circulation increases. At the end of a workout, your body temperature can easily end up upwards of 37 degrees. If you then immediately hop in the shower, you're not giving your body time to recover and get back to its normal temperature.
There can be an impact on blood pressure as you may contract your dilated blood vessels too quickly. There's even a risk of thermal shock if the shower is too cold. It's really important to wait for the heart rate and body temperature to return to normal before taking a shower.
The ideal waiting time varies from person to person, but 20 to 30 minutes is a good rough guideline. The main thing is that your body has to stop sweating first. So enjoy that post-workout endorphin high while it lasts, rehydrate by drinking plenty of water, and maybe spend the time transitioning to a gentler exercise or stretching routine.
Is it better to take a hot or cold shower?
There are pros and cons to both. It mostly comes down to personal preference and needs. A lot of people aren't aware of the benefits of each type, so let's get into them.
Some of the key benefits of taking a hot shower include helping with muscle relaxation, opening up the pores of your skin to clean out trapped dirt and oil, and providing relief when you have a cold. That's because a hot shower helps with opening up the airways and clearing out the nasal passages.
Meanwhile, the benefits of a cold shower include calming itchy skin, boosting blood circulation, waking you up and helping with muscle soreness. Taking a cold shower isn't the best thing to do if you're already feeling cold. For example, if it's winter and you're feeling under the weather. There you have it!
词汇表
intense [ɪnˈtens] adj. 强烈的，剧烈的
sweaty [ˈsweti] adj. 出汗的，满是汗的，大汗淋漓的
work up a sweat 出一身汗，大汗淋漓
blood circulation [ˌsɜːkjəˈleɪʃ(ə)n] 血液循环
hop in the shower [hɒp] 快速冲个澡，立即冲澡
contract [kənˈtrækt] v. （使）收缩，缩小
dilated blood vessels [daɪˈleɪtɪd blʌd ˈves(ə)lz] 扩张的血管
thermal shock [ˈθɜːm(ə)l] 热休克（温度突然变化对生物体、细胞产生的影响）
rough guideline [rʌf ˈɡaɪdlaɪn] 大致参考，粗略指南
post-workup endorphin high [enˈdɔːfɪn] 运动后的内啡肽带来的愉悦感，运动后的内啡肽快感
rehydrate [ˌriːhaɪˈdreɪt] v. 补充水分，喝水
stretching routine [ˈstretʃɪŋ ruːˈtiːn] 拉伸练习，常规拉伸
pros and cons [prəʊz ənd kɒnz] 利弊，优缺点
pore [pɔː(r)] n. （皮肤的）毛孔
trapped dirt and oil [træpt] 堵塞的污垢和油脂
airway [ˈeəweɪ] n. 气道，呼吸道
nasal passages [ˈneɪz(ə)l ˈpæsɪdʒɪz] 鼻腔通道，鼻道
itchy [ˈɪtʃi] adj. 发痒的，瘙痒的
soreness [ˈsɔːnəs] n. 酸痛，疼痛
under the weather 身体不适，不舒服
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