"一九二九不出手，三九四九冰上走。"我国民间从冬至开始"数九"，每9天算"一九"，从"一九"数到"九 九"，冬寒才算真正结束。 今天是冬至，正是数九寒天的开始，意味着一年中最冷的时段即将到来。 《生命时报》邀请专家解读此时的养生重点，带你顺利度过数九天。 这些部位比你更怕冷 冬至时节，自然界阳气很弱，"人体阳气微，气血不足"，身体也出现一系列状况。 血管变黏 寒冷刺激造成心脏收缩力增强，周围血管收缩、黏稠度增加，导致收缩压及舒张压上升，易导致脑出 血、脑梗塞等。 数九天，"养阳"是关键 心脏负担重 数九作为一年中最冷的时令，是人体功能最易受干扰的时段，也是最适合调整人体功能的时机。 五脏六腑皆易受寒邪侵袭、损伤阳气，因此保护阳气是冬季养生的重要原则。 寒冷时，为给身体供应能量，心率会增加，心脏的耗氧量和工作负荷也会增大。低温时血液更黏稠，流 速更慢，进一步加重心脏负担。 呼吸道应激 寒冷干燥的空气会让鼻子发干，刺激咽喉部位，还会使小气管收缩，以致出现呼吸道应激反应。! 手脚冰凉 外界温度过低时，更多血液会流向身体中心，给重要脏器供应氧气和养分；手指、脚趾、耳朵等末梢部 位就会因为血流减少而感觉寒冷。 皮肤干痒 ...

Group 1 - The current hot season, known as "Da Shu," is a good time for "yang nurturing," with methods like sunbathing being popular [1] - Not everyone is suitable for sunbathing; individuals with weak constitutions, the elderly, and those with skin allergies should avoid it [1][3] - People with underlying health conditions such as hypertension, coronary heart disease, and hyperlipidemia are also advised against sunbathing [1] Group 2 - For individuals with a cold constitution, sunbathing can be beneficial, but precautions must be taken regarding weather, duration, and post-sunbathing care [3] - It is recommended to start with 5-10 minutes of sun exposure, gradually increasing to 15-30 minutes, 2-3 times a week [3] - After sunbathing, individuals should avoid cold showers and air conditioning immediately, allowing the body to cool down naturally [3] Group 3 - During the hot season, outdoor workers like delivery personnel are at high risk of heatstroke [4][6] - Symptoms of heatstroke include headache, dizziness, and excessive sweating; individuals should rest in a cool place and hydrate if these symptoms occur [4] - If symptoms worsen, immediate cooling measures and medical attention are necessary [4] Group 4 - Outdoor workers are advised to take proactive measures such as wearing protective clothing and taking regular breaks in shaded areas [6] - Hydration is crucial; workers should drink water regularly, preferably electrolyte-rich beverages, and avoid ice-cold drinks [6] - Alcoholic and high-sugar drinks should be avoided as they can burden the body [6]