Table 3. .

Sample Sweat-Rate Calculations

Modifying Factor	Individual A (Recreational Tennis Player, Female, 85 kg)	Individual B (Recreational Runner, Male, 80 kg)	Individual C (Collegiate Football Player, Male, 120 kg)	Individual D (Collegiate Soccer Player, Female, 60 kg)
Wet-bulb globe temperature, °C (°F)	25 (77)	22 (71.6)	29 (84.2)	28.3 (83)
Acclimatized to heat?	Yes	No	Yes	Yes
Exercise mode	1.5 h	10-km Race (0.75 h)	2.5-h Practice	Soccer game (1.5 h)
Exercise intensity	Mild/moderate (50%)	Maximal	Intermittent maximal	Intermittent maximal
Hydration status before activity	1% Hyperhydrated (85.9 kg)	Euhydrated	Euhydrated	Euhydrated
Available breaks	When feasible	Every mile (1.6 km)	Consistent breaks	Half-time (athletic administrators should consider fluid breaks based on environmental factors)
Postexercise hydration status	–1.5% Body mass (1.3 kg)	–1% Body mass (0.8 kg)	–5% Body mass (6.0 kg)	–2.5% Body mass (1.5 kg)
Fluid consumed	0.8 L	0.4 L during race	2 L during breaks	0.5 L at half-time
Sweat rate	1.3 kg + 0.8 L/1.5 h = 1.4 L/h	0.8 kg + 0.4 L/0.75 h = 1.6 L/h	6.0 kg + 2.0 L/2.5 h = 3.2 L/h	1.5 kg + 0.5 L/1.5 h = 1.3 L/h
Recommendation for similar exercise	Drink when thirsty; may also benefit from paying attention to personal hydration cues before exercise to ensure euhydration rather than overhydration.	Doing a great job. Finished the race at 1% body mass loss.	Body mass loss is likely affecting performance and increasing heat-illness risk during activity. Increase fluid consumption and try to approximate sweat rate to avoid >2% (2.4-kg) body mass loss during activity.	Due to a lack of fluid availability, try to begin exercise 0.5% hyperhydrated and ingest a little more fluid at half-time. This will limit body mass loss and prevent >2% hypohydration at game end. Slight hyperhydration for an individual with proper oversight may be beneficial in this case.