Abstract
Skin blood flow (SkBF) was measured in six male subjects using laser-Doppler velocimetry, with zero-gradient auditory canal temperature (Tac) used as an index of body core temperature (Tc). Subjects performed incremental, upright cycling commencing at 40% peak power (\(\dot W\) peak: 10 min), increasing every 4 min by 5 % \(\dot W\) peak thereafter. Trials were conducted in hot (ambient temperature (Ta) 36.7 ±0.2°C, relative humidity (rh) 46.1 ±3.2%; \(\dot W\) peak ±S.D.), and neutral environments (Ta 19.6 ±0.3°C, rh 50.2 ±1.4%). SkBF increased with Tac in all subjects. Attenuation of SkBF occurred at the same Tac, relative SkBF and cardiac frequency (f c) between environments, but at a lower exercise intensity (40.8 ±0.8% versus 55.8 ±3.0% \(\dot W\) peak) in the hot environment (p<0.05). Data indicate that Tc thresholds for SkBF attenuation may exist. However, it is suggested that attenuation thresholds coincided with a reduced central blood volume, which may occur at a critical level of cutaneous blood pooling.
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Patterson, M.J., Warlters, D. & Taylor, N.A.S. Attenuation of the cutaneous blood flow response during combined exercise and heat stress. Eur J Appl Physiol 69, 367–369 (1994). https://doi.org/10.1007/BF00392045
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DOI: https://doi.org/10.1007/BF00392045