Table 2.
Heat exchanges, body temperatures, cutaneous blood flows and sudomotor responses during light and moderate exercise
| Light Work | Moderate Work | |
|---|---|---|
| Heat exchange, W/m2 | ||
| Dry-heat loss, Eq. 2 | 50 ± 1 | 56 ± 3 |
| Evaporative-heat loss, mass change | 63 ± 3 | 162 ± 8 |
| Evaporative heat-loss requirement, Eq. 7 | 83 ± 1 | 142 ± 2 |
| Body temperature, °C | ||
| Auditory canal temperature | 37.0 ± 0.0 | 37.2 ± 0.1 |
| Mean skin temperature | 33.3 ± 0.1 | 33.9 ± 0.1 |
| Mean body temperature | 36.3 ± 0.0 | 36.6 ± 0.0 |
| Cutaneous blood flow | ||
| Forearm, ml·100 ml−1·min−1 | 5.29 ± 0.15 | 8.46 ± 0.38 |
| Local, % of initial resting value* | 145.7 ± 13.4 | 293.1 ± 18.1 |
| Cutaneous vascular conductance | ||
| Forearm, ml·100 ml−1·min−1·mmHg−1 | 0.06 ± 0.00 | 0.08 ± 0.00 |
| Local, % of initial resting value* | 134.4 ± 13.0 | 345.3 ± 21.3 |
| Local sweat rate, mg·cm−2·min−1 | ||
| Dorsal hand | 0.60 ± 0.06 | 2.02 ± 0.09 |
| Dorsal forearm | 0.27 ± 0.03 | 1.27 ± 0.07 |
| Upper back | 0.32 ± 0.04 | 1.38 ± 0.10 |
| Forehead | 0.56 ± 0.06 | 2.55 ± 0.17 |
| Sudomotor sensitivity, mg·cm−2·min−1·°C−1 | ||
| Dorsal hand | 2.74 ± 0.26 | 3.22 ± 0.18 |
| Dorsal forearm | 1.73 ± 0.16 | 2.32 ± 0.16 |
| Upper back | 1.79 ± 0.24 | 2.35 ± 0.18 |
| Forehead | 2.71 ± 0.28 | 4.12 ± 0.26 |
Values are given as means ± SE. Light work consisted of exercise at approximately 135 W/m2 (n = 36); moderate work occurred at approximately 200 W/m2 (n = 35). Subjects performed two trials (28°C, 37% relative humidity), each commencing with seated rest (20 min) followed by either light or moderate (45 min) exercise.
*
Local cutaneous blood flows (laser-Doppler flowmetry) and vascular conductances were not determined in all participants (light work n= 33 and moderate work n = 28).