Effects of artificially-induced anaemia on sudomotor and cutaneous blood flow responses to heat stress |
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Authors: | Nigel A S Taylor Mark J Patterson James D Cotter and Duncan J Macfarlane |
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Institution: | (1) Department of Biomedical Science, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia, AU;(2) Physical Education and Sports Science Unit, University of Hong Kong, Hong Kong, HK |
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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 (V˙O2peak), and 20 min cycling at 45% V˙O2peak] were completed before (HST1) and 3–5 days after 3 units of whole blood were withdrawn (HST2).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 (m˙
sw) exceeded control levels during exercise (P < 0.05), while a suppression of forehead m˙
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.
Accepted: 17 April 1997 |
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Keywords: | Anaemia Exercise Heat stress Skin blood flow Sweating |
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