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Effects of artificially-induced anaemia on sudomotor and cutaneous blood flow responses to heat stress

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Abstract

The influence of artificially induced anaemia on thermal strain was evaluated in trained males. Heat stress trials (38.6°C, water vapour pressure 2.74 kPa) performed at the same absolute work rates [20 min of seated rest, 20 min of cycling at 30% peak aerobic power (O2peak), and 20 min cycling at 45% O2peak] were completed before (HST1) and 3–5 days after 3 units of whole blood were withdrawn (HST2). Mild anaemia did not elevate thermal strain between trials, with auditory canal temperatures terminating at 38.5°C [(0.16), HST1] and 38.6°C [(0.13), HST2; P > 0.05]. Given that blood withdrawal reduced aerobic power by 16%, this observation deviates from the close association often observed between core temperature and relative exercise intensity. During HST2, the absolute and integrated forearm sweat rate ( sw) exceeded control levels during exercise (P < 0.05), while a suppression of forehead sw occurred (P < 0.05). These observations are consistent with a possible peripheral redistribution of sweat secretion. It was concluded that this level of artificially induced anaemia did not impact upon heat strain during a 60-min heat stress test.

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Accepted: 17 April 1997

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Taylor, N., Patterson, M., Cotter, J. et al. Effects of artificially-induced anaemia on sudomotor and cutaneous blood flow responses to heat stress. Eur J Appl Physiol 76, 380–386 (1997). https://doi.org/10.1007/s004210050265

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  • DOI: https://doi.org/10.1007/s004210050265

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