---
title: "What Is Hydration? Heat Stress and Hydration Glossary"
description: "Hydration is keeping enough fluid and electrolytes in the body to work well. For crews in the heat, it means steady drinking all shift, not only when thirsty."
url: https://jmarsolutions.multisites.ai/glossary/hydration
publisher: JMAR Solutions
phone: +1-214-632-7780
quote: https://jmarsolutions.multisites.ai/contact
---

Hydration science

# Hydration

Hydration is keeping enough fluid and electrolytes in the body to work well. For crews in the heat, it means steady drinking all shift, not only when thirsty.

Hydration means the body has enough fluid to work properly. On a hot jobsite, sweat pulls fluid and salts out fast. Crews need to replace both. NIOSH says employers should provide the means for appropriate hydration of workers, and workers should drink an appropriate amount to stay hydrated.

Good hydration is a habit, not a single drink. Water first, within reach of the crew. When sweating lasts for hours, add [electrolytes](https://jmarsolutions.multisites.ai/glossary/electrolyte). Poor hydration leads to [dehydration](https://jmarsolutions.multisites.ai/glossary/dehydration), which adds to [heat stress](https://jmarsolutions.multisites.ai/glossary/heat-stress). Build the habit into your [jobsite hydration plan](https://jmarsolutions.multisites.ai/guides/jobsite-hydration-plan). Rapid Restoration Drops are a dietary supplement that replaces electrolytes lost in sweat and supports hydration.

[From JMAR SolutionsHydration programs and toolbox talks for crews](https://jmarsolutions.multisites.ai/hydration-programs)

## Related terms

-   [Dehydration](https://jmarsolutions.multisites.ai/glossary/dehydration)
-   [Electrolyte](https://jmarsolutions.multisites.ai/glossary/electrolyte)
-   [Sweat rate](https://jmarsolutions.multisites.ai/glossary/sweat-rate)
-   [Heat stress](https://jmarsolutions.multisites.ai/glossary/heat-stress)
-   [Water rest shade](https://jmarsolutions.multisites.ai/glossary/water-rest-shade)

## Sources

1.  [CDC NIOSH: Heat Stress Workplace Recommendations](https://www.cdc.gov/niosh/heat-stress/recommendations/index.html)
2.  [CDC NIOSH: Heat Stress Workplace Recommendations](https://www.cdc.gov/niosh/heat-stress/recommendations/index.html)

![Ironworkers silhouetted on a steel frame against a hot orange sunset](https://jmarsolutions.multisites.ai/_astro/sunset-steel.IhAMDca0_6wk53.webp)

## See it on your crew in 15 minutes

Jennifer walks your safety team through the drops, the protocol and the numbers on a short live call.

[Book a 15-minute demo](https://calendly.com/jen-jmarsolutions/15-min-meeting)