To find whether sweat rate (SR) and forearm skin blood flow (SkBF) were reflexly affected by skin temperature (T(sk)) we used water-perfused suits to rapidly elevate T(sk) during exercise. With this elevation in T(sk), there was a period of little net change in esophageal temperature (T(es)) but marked responses in SR and SkBF. During this period a rise in T(sk) of 4.2 ± 0.3 °C was associated with an increase in SR of 0.44 ± 0.09 mg.cm-2.min-1 and an increase in SkBF of 3.27 ± 0.42 ml.100 ml-1.min-1. Multiple linear regression analysis as well as comparison with control studies in which T(sk) was kept cool also reveal a consistent role for T(sk) in the reflex regulation of SR and SkBF. Responses in SR and FBF were much more marked at levels of T(sk) below 33°C. Below a T(sk) of 33° C, SR rose 0.30 ± 0.06 mg.cm-2.min-1 per °C rise in T(sk), whereas above 33° SR rose only 0.05 ± 0.01 mg.cm2.min per °C. FBF rose 2.81 ± 0.60 and 0.77 ± 0.18 ml.100 ml-1.min-1 per °C rise in T(sk) at the lower and upper ranges of T(sk), respectively.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of Applied Physiology Respiratory Environmental and Exercise Physiology|
|State||Published - 1984|
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