Previous history of symptoms and diagnosis of heat illness in athletes (% of responders) competing in the 2015 IAAF World Championships
| Field | Sprints | Middle distance | Long distance | Decathlon/ heptathlon | |
|---|---|---|---|---|---|
| History of heat illness symptoms | |||||
| Cramping | 27.6 | 26.1 | 16.2 | 25.5 | 33.3 |
| Vomiting | 7.9 | 20.5 | 8.1 | 10.6 | 16.7 |
| Nausea | 9.2 | 17.0 | 8.1 | 13.8 | 16.7 |
| Severe headache | 14.5 | 22.7 | 29.7 | 11.7 | 33.3 |
| Collapsing/fainting | 3.9 | 3.4 | 5.4 | 9.6 | 0.0 |
| Other | Dizziness, tiredness, gastrointestinal issues, tachycardia | ||||
| History of heat illness diagnosis | |||||
| Dehydration | 5.3 | 2.3 | 5.4 | 5.3 | 8.3 |
| Hyponatraemia | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Heat exhaustion | 1.3 | 1.1 | 0.0 | 3.2 | 8.3 |
| Heat stroke | 0.0 | 3.4 | 0.0 | 2.1 | 0.0 |
IAAF, International Association of Athletics Federations.