Sweat Rate Testing

Know exactly how much fluid you lose per hour during exercise. Individual sweat rate measurement — then a precise hydration and electrolyte plan for your race and training.

£125 · ~45 min · UNTIL Liverpool Street & Marylebone

How it works

1. Weigh In — Pre-exercise weight recorded. Details on your training context and target event taken so the protocol matches your real conditions.
2. Exercise Protocol — Standardized exercise at a controlled intensity with controlled fluid intake. Duration and intensity matched to your event context.
3. Results — Post-exercise weight measured. Sweat rate calculated, hydration strategy set. Written report with race-day targets.

What we measure

• Sweat Rate — Fluid lost per hour of exercise. Sweat rate in litres per hour (L/hr). Individual variation: ~0.5L to 2.5L/hr.
• Hydration Strategy — Target fluid intake per hour during exercise. Pre-exercise and post-exercise rehydration guidance.
• Electrolyte Guidance — Estimated sodium loss per hour. Electrolyte supplementation guidance and cramping risk assessment.

Key facts

• Duration: 30 minutes
• Price: £125
• Locations: Liverpool Street · Marylebone
• Method: Pre/post weighing, controlled conditions
• Format: 1:1 with a coach

What you leave with

• Hourly sweat rate — Your individual fluid loss per hour measured at race intensity.
• Hydration strategy — Fluid and electrolyte replacement guidance built from your measured rate.
• Written report — Your figures with practical application for training and race day.

Who this is for

• Marathon runners
• Triathletes
• Cyclists
• HYROX competitors
• Anyone racing in warm conditions or at longer distances where fluid strategy affects performance

Who it isn't for

• Athletes in short-duration events where fluid loss does not meaningfully accumulate
• Anyone wanting a full nutrition consultation rather than hydration data specifically

Frequently asked questions

What is sweat rate testing?

Sweat rate testing measures how much fluid you lose per hour of exercise at a given intensity. The test uses pre- and post-exercise body weight, corrected for any fluid consumed during exercise. The result is your personal sweat rate — the starting point for a fully individualised hydration strategy.

Why does sweat rate matter?

Dehydration of as little as 2% body weight impairs performance — reducing endurance, increasing perceived effort and impairing thermoregulation. Sweat rates vary from approximately 0.5L to 2.5L per hour depending on the individual, sport, intensity and environment. Knowing your rate removes the guesswork.

Who is sweat rate testing for?

Any endurance athlete who wants to optimise performance and reduce the risk of dehydration or hyponatraemia (over-drinking). Particularly relevant for marathon runners, triathletes, cyclists, HYROX competitors and anyone racing in warm conditions or at longer distances where fluid strategy has a direct impact on performance.

Do results change with temperature?

Yes. Sweat rate increases significantly in warm or humid conditions. The test establishes your baseline rate, and the report includes guidance on how to adjust your hydration targets for warmer environments or race conditions.

What about electrolytes?

The report includes estimated sodium loss per hour and practical guidance on electrolyte supplementation. High sweat rates combined with inadequate sodium replacement is one of the most common causes of race-day cramping and performance decline in longer events.

Can I combine this with VO₂ Max Testing?

Yes. Combining sweat rate testing with VO₂ Max Testing gives you a complete performance and fuel picture — metabolic zones, fuel targets and hydration strategy in one session.

How much does it cost and how long does it take?

£125 for the full session. Allow approximately 45 minutes to 1 hour including the exercise protocol, measurements and results review.

Where is testing available?

At DVOTION's London locations: UNTIL Liverpool Street and UNTIL Marylebone.

Other assessments

• VO₂ Max & Blood Lactate Testing — £350
• Resting Metabolic Rate Testing — £135
• Complete Athlete Profiling Assessment — £895
• Movement Strategy Analysis — £350
• Power Output Assessment — £300

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