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. |