Table 4.
Incidence of Decreased Performance and Heat Illness Related to Inadequate Hydration (N = 276)
Item | Responseb | Groupa |
|||
Low | Mod | High | Total | ||
1. Have you ever experienced a major decrease in running performance that you feel was caused from being dehydrated? | No, % | 36 | 27 | 17 | 27 |
Once, % | 29 | 26 | 21 | 25 | |
More than once, % | 33 | 41 | 59 | 44 | |
Do not know, % | 2 | 5 | 3 | 4 | |
Mean ± SD | 2.0 ± 0.8c | 2.1 ± 0.8 | 2.4 ± 0.8 | 2.2 ± 0.8 | |
2. Have you ever suffered heat-related illness symptoms (severe muscle or stomach cramping, light-headedness, dizziness, nausea, or loss of ability to think clearly) while running that you feel were caused from being dehydrated? | No, % | 58 | 62 | 45 | 55 |
Once, % | 21 | 16 | 28 | 22 | |
More than once, % | 21 | 21 | 26 | 23 | |
Do not know, % | 1 | 1 | 0 | 1 | |
Mean ± SD | 1.6 ± 0.8 | 1.6 ± 0.8 | 1.8 ± 0.8 | 1.7 ± 0.8 |
a Low, Mod, and High are tertile classifications based on training volume, expected performance, and running experience.
b 1, no; 2, once; 3, more than once.
c Different from High (P = .001).