Hydration & Sweat-Rate Planner饮水携水与出汗率规划器

Liters per hour for the temperature and effort you expect, water weight to the next source, a sip-reminder timetable, a urine-color chart — and a personal sweat-rate test. 按气温与强度给出每小时饮水区间、到下一水源的携水量与水重、补水提醒时刻表、尿色量表，以及个人出汗率测试。

🥤 Water & Hydration水与饮水 📅 Updated Oct 20252025 年 10 月更新

How the hydration planner works

Thirst lags behind fluid loss, so the plan replaces water on a schedule instead of waiting until you feel dry. The midpoint rate starts from effort — about 0.5 L/h for camp chores, 0.7 L/h for steady hiking and 0.9 L/h for hard efforts with big vert or a heavy pack — then adjusts for heat and body size.

The air-temperature multiplier runs from 0.85 below 10 °C to 1.45 above 32 °C, and a body-size factor adjusts only ±15% around a 70 kg hiker. Your personal range is the midpoint at −20% to +25%, and the upper number is hard-capped at 1.5 L/h. Water need to the next source is midpoint × moving hours; recommended carry rounds up to the nearest 0.5 L, and every liter weighs exactly 1 kg (2.2 lb).

Why 1.5 liters per hour is a ceiling, not a target

The American College of Sports Medicine notes that healthy kidneys cannot excrete more than roughly 1.0–1.5 L of fluid per hour during exercise. Drinking beyond your losses dilutes blood sodium — exercise-associated hyponatremia — which causes headache, confusion, seizures and occasionally death in otherwise fit hikers. When heat demand exceeds the cap the answer is sodium (roughly 300–700 mg/h), slower pace and shade, never forced water.

The sweat-rate test tab

The gold-standard field method is simple: weigh yourself dry before a steady 60–90 minute hike, weigh again towel-dried afterward, and record every milliliter drunk and urinated. Sweat loss (L) = (pre − post weight in kg) + fluid consumed − urine; divide by hours to get your personal L/h. Aim to replace about 80–100% of it on matching days, and treat any weight gain during exercise as an overhydration warning. Losing more than 2% of body weight is the ACSM threshold where performance and judgment deteriorate.

Urine color is your real-time gauge

Check at every break: pale lemon (levels 1–3 on the chart below the calculator) means you are tracking well; honey gold or darker means you are already behind. Completely clear urine all day can mean you are over-drinking.

计算原理

口渴总是滞后于脱水，所以本计划按时刻表规律补水，而不是等觉得渴了再喝。中值速率先按强度取——营地杂务约 0.5 升/时、常态徒步 0.7 升/时、大爬升或重装的大强度约 0.9 升/时——再按高温与体重调整。

气温系数从低于 10 °C 的 0.85 到高于 32 °C 的 1.45；体重系数围绕 70 公斤仅在 ±15% 范围内调整。个人饮水区间为中值的 −20% ～ +25%，上限被硬性封顶在 1.5 升/时。到下一水源的需水量 = 中值 × 行进小时数；建议携带量按 0.5 升向上取整，每升水正好重 1 千克（2.2 磅）。

为什么 1.5 升/时是上限而不是目标

美国运动医学会（ACSM）指出，健康人在运动中肾脏每小时最多排出约 1.0～1.5 升液体。饮水超过流失量会稀释血钠——运动相关低钠血症——可导致头痛、意识模糊、抽搐，体健的徒步者也可能因此死亡。当热需求超过上限时，正确做法是补钠（约每小时 300～700 毫克）、放慢速度、找阴凉，而不是硬灌水。

出汗率测试标签页

野外金标准方法很简单：在一次 60～90 分钟稳定徒步前擦干身体称重，结束后擦干再次称重，并记录喝入与排出的每毫升液体。出汗量（升）=（徒步前体重 − 徒步后体重，千克）+ 饮水量 − 尿量，再除以小时数即得到你个人的升/时。在类似天气里目标补回其中的约 80～100%；运动中体重增加则是饮水过量的警示。体重下降超过 2% 是 ACSM 给出的运动表现与判断力下降阈值。

尿色是实时仪表

每次休息都查看：淡柠檬黄（计算器下方量表 1–3 号）说明节奏不错；蜂蜜金或更深说明已经缺水。一整天尿液都完全透明，则可能喝多了。

Frequently asked questions常见问题

Isn’t drinking as much water as possible safer in the heat?天热时水喝得越多越安全吗？

No — over-drinking causes hyponatremia and can be more dangerous than mild dehydration, especially on efforts under four hours. Cap intake near 1.5 L/h, add 300–700 mg sodium per hour when sweating hard for over an hour, and use urine color plus your measured sweat rate rather than a gallon-a-day rule.不是——过量饮水会引起低钠血症，在 4 小时以内的活动中可能比轻度脱水更危险。饮水控制在约 1.5 升/时以内，剧烈出汗超过 1 小时时每小时补 300–700 毫克钠，并用尿色和实测出汗率判断，而不是套用“每天一加仑”之类的死板规则。

How do I run the sweat-rate test correctly?怎样正确做出汗率测试？

Use the same accurate scale both times, wear the same dry clothing (or nothing), empty your bladder first, and weigh before drinking. After 60–90 minutes of steady effort, towel dry and weigh before recovery food or drink. Log every sip from pre-marked bottles and estimate urine against bottle volume. Repeat once in cool conditions and once on your hottest expected terrain.两次使用同一台准确体重秤、穿同样的干爽衣物（或裸体），先排空膀胱、喝水前称重。稳定运动 60～90 分钟后擦干身体，在恢复性进食饮水之前再称一次。用预先标好刻度的瓶子记录每一口水，尿量对照瓶身估算。建议凉爽条件测一次、预计最热的地形再测一次。

Do I need electrolyte tablets, or is salty food enough?必须买电解质片吗，吃咸的行不行？

For easy hiking under an hour, normal meals usually suffice. Beyond that in heat, target about 300–700 mg sodium per hour (500–1000 mg/h for sweat rates above 0.8 L/h) — pretzels, salted nuts, broth or an electrolyte mix all count. Sodium also helps the gut absorb the water you drink, so food and fluid work together.1 小时以内的轻松徒步，正常饮食通常就够了。炎热环境超过 1 小时，建议每小时约 300～700 毫克钠（出汗率高于 0.8 升/时则 500～1000 毫克）——椒盐脆饼、咸坚果、咸汤或电解质粉都可以。钠还能帮助肠道吸收水分，食物和水要一起补。

Does this plan work in winter?这个计划冬天适用吗？

Yes — cold air reduces thirst and increases respiratory water loss, so dehydration is common on snow trips even though you feel less thirsty. The cold band lowers the per-hour volume slightly, but the schedule matters more: keep water insulated against your body, blow water back out of hydration-bladder tubes, and remember snow is not drinking water until melted (see the Stove Fuel & Snowmelt calculator).适用——冷空气会抑制口渴感并增加呼吸失水，所以雪地行程中即使不觉得渴也普遍脱水。低温档会略降每小时水量，但按时刻表喝更重要：把水贴身保温、水袋吸管喝完吹回管内，并记住雪在融化前不是饮用水（参见炉具燃料与融雪计算器）。

What if the next source is farther than my carry capacity?下一水源太远、带不下那么多水怎么办？

When the balance shows a shortfall, treat it as a route-planning problem before the trip: add a collapsible bottle, cache water on the way in, plan a sterilizing boil or snowmelt point, or hike the dry stretch in the cooler morning hours with a pre-hydrated start. Never gamble on an unconfirmed spring in dry terrain.当余量显示为负，要在出发前当作路线规划问题解决：增加折叠水瓶、途中预设水点、安排煮沸或融雪补水点，或者趁清晨凉爽走完无水路段并提前补水。在干旱地形上，绝不要把赌注押在一个无法确认的泉眼上。

Sources & methodology

出处与计算原理

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General guidance, not medical advice. Heart or kidney conditions and some medications change fluid and sodium needs — ask your clinician. Confusion, vomiting or collapse in the heat is an emergency: cool, call for help, do not force fluids. 本工具为通用参考，不构成医疗建议。心脏或肾脏疾病、某些药物会改变水与钠的需求——请咨询医生。高温下出现意识模糊、呕吐或晕倒属于急症：立即降温并求救，不要强行灌水。