TABLE 2.
Sweat rate, sweating kinetics and hydration during exercise in four different environments
| Cool | Moderate | Hot | Hot Humid | |
|---|---|---|---|---|
| Sweat rate (L/h) | 0.41 (0.17) †,‡ | 0.70 (0.28) ‡ | 1.07 (0.35) | 1.03 (0.36) |
| Sweat onset (min) | 9.6 (3.0) †,‡ | 7.3 (1.6) ‡ | 4.3 (1.6) | 3.1 (1.7) ‡ |
| T c threshold (°C) | 37.3 (0.4) ‡ | 37.1 (0.4) | 36.9 (0.4) | 37.0 (0.4) |
| Fluid intake (ml) | 470 (310) †,‡ | 670 (329) ‡ | 1022 (393) | 1143 (474) |
| Dehydration (%) | 0.5 (0.4) ‡ | 0.8 (0.5) | 1.0 (0.5) | 0.7 (0.6) |
Data are means (SD). Sweat rate calculated over duration of protocol's entirety (45‐min fixed‐intensity cycling followed by a 20‐km time‐trial). T c threshold indicates the core temperature at which the onset of sweating occurred. Dehydration expressed as a percentage of initial body weight. †Significant difference from Moderate (P < 0.05); ‡significant difference from Hot (P < 0.05). n = 14. T c, core temperature (rectal).