---
title: "Salt doesn’t hydrate you. It can still save your ride."
date: 2025-10-12
categories: ["Hydration & heat"]
url: https://www.semiprocycling.com/digest/salt-doesnt-hydrate-you-it-can-still-save-your-ride
author: Damian Ruse (SEMIPRO Cycling)
---
# Salt doesn’t hydrate you. It can still save your ride.

![](https://www.semiprocycling.com/digest/images/496f6942b1ffbad0fc31e456.webp)

A 2025 review pulls sodium out of the hype and shows when it actually helps. It works only in tandem with water, and mainly when you’re replacing most of your sweat in long, hot efforts. The decision tree below is from that paper and is the simplest way to choose a sodium plan.

![](https://www.semiprocycling.com/digest/images/331e5314891aec09085faf32.webp)

## How to use the chart

1. **Ride under 4 hours**    → Season to taste. Pick a drink you like. Drink to thirst. Detailed sodium targeting is unnecessary.
2. **Ride over 4 hours**    - **Sweat rate over ~1.8 L per hour**      → Season to taste. Replacing a high share of losses is impractical and often not needed.   - **Sweat rate under ~1.8 L per hour**      • **You’ll replace less than 70 percent of fluid losses**      → Season to taste. Blood sodium rises anyway, even if you lose a lot of salt.      • **You’ll replace more than 70 percent of fluid losses**      → Now it’s worth targeting sodium. Consider a sweat sodium test and use these ranges:      - **Sweat sodium > 60 mmol per L**        Replace about **40–70 percent** of sodium losses if you replace **70–90 percent** of fluid. If you replace **90–95 percent** of fluid, aim for **80–90 percent** of sodium losses.     - **Sweat sodium 40–60 mmol per L**        Replace about **20–55 percent** of sodium losses at **70–90 percent** fluid replacement. If at **90–95 percent** fluid, aim for **70–80 percent** of sodium losses.     - **Sweat sodium < 40 mmol per L**        At **70–90 percent** fluid, season to taste. If at **90–95 percent** fluid, replace roughly **40–70 percent** of sodium losses.

## Quick example

You plan a 6‑hour hot ride. Sweat rate 0.9 L per hour. You’ll drink ~0.7 L per hour (about 78 percent of losses). Your sweat sodium is ~60 mmol per L.

Losses: ~1,240 mg sodium per hour. Target 40–70 percent of that → **~500–870 mg sodium per hour**. Use a palatable drink and add capsules if needed. Test this in training.

## After the ride

If you rehydrate with low‑energy drinks only, extra sodium helps you retain fluid. If you eat food or use nutrient‑rich drinks like milk, added sodium matters less.

## The surprises

- **Daily salt supplements aren’t needed** for most athletes. Kidneys and sweat glands adjust over days.
- **Sodium doesn’t boost performance by itself.** Any gains trace to better fluid balance and drink palatability.
- **Sweat testing is often unnecessary.** It only adds value when you’re riding over 4 hours and replacing more than 70 percent of fluid.
- **Overdrinking is the main risk.** Don’t aim to replace 100 percent of losses during the event.

## Bottom line

Plan fluids first. Only target sodium when your ride is long and you can replace most of what you sweat. Otherwise, season to taste and focus on feel.

## Source

McCubbin AJ. Sodium intake for athletes before, during and after exercise: review and recommendations. Performance Nutrition, 2025.

## On my mind: The Quiet Coach

I was a young rider chewing the bars on a long climb. My legs burned and my mind was fighting harder than my body.

One voice snapped at me for being weak. The other said just reach the next bend.

I chose the second voice. I sat up, breathed, took a sip, and rode to the next bend, then the next one. The hill didn’t get any smaller, but it stopped owning me. Near the top, the angry voice was gone. The quiet one stayed.

That day I realised the most powerful coach is the voice no one hears. Feed it and it feeds you back. Starve it and your training starves with it.

When you make a mistake this week, speak to yourself like you would to a good mate. Ask for the next bend. Keep asking.

Damian