What is the dehydration threshold for aerobic performance?

Studies consistently show aerobic performance declines starting at 1.5-2% body weight loss from sweat. A 2% deficit reduces VO2max by ~10-20% in hot conditions, though the effect is smaller in cool environments.

How does dehydration affect strength?

Strength performance is less sensitive to dehydration than aerobic performance. Losses of 2-3% body weight may reduce maximal strength by 2-5%, with greater effects on muscular endurance and power.

At what point is dehydration dangerous?

At 5% body weight loss, nausea, irritability, and significant performance impairment occur. Above 7-8%, medical emergency risk increases substantially. Heat stroke risk rises significantly with increasing dehydration in hot conditions.

Dehydration Performance Loss Calculator

Calculate the expected performance decrement from dehydration as a percentage of body weight loss, with separate estimates for aerobic capacity, strength, and cognitive function.

Use the full interactive calculator below, or

Related Calculators

Hydration Status

Sports & Fitness

Sweat Rate

Sports & Fitness

Exercise Fluid Intake

Sports & Fitness

Dehydration Performance Loss Calculator

Related Calculators

Frequently Asked Questions

What is the dehydration threshold for aerobic performance?

How does dehydration affect strength?

At what point is dehydration dangerous?