Arterial blood pressure during voluntary diving in the tufted duck,Aythya fuligula |
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Authors: | R M Bevan P J Butler |
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Institution: | (1) School of Biological Sciences, University of Birmingham, Edgbaston, B15 2TT Birmingham, UK |
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Abstract: | Arterial blood pressure was monitored in voluntarily diving tufted ducks. Mean arterial blood pressure while diving increased during the pre-dive tachycardia, fell to resting levels on submersion, then gradually increased before peaking on surfacing. Estimated total peripheral resistance fell during the pre-dive and post-dive tachycardia, presumably to allow the oxygen stores to be loaded and replenished respectively and/or for carbon dioxide levels to be reduced. Changes in mean arterial blood pressure and total peripheral resistance suggest that peripheral vasoconstriction occurs in some vascular beds during a dive. An increase in arterial blood pressure (and therefore perfusion pressure) may be employed to increase blood flow and oxygen delivery to the active leg muscles.Abbreviations ecg
Electrocardiogram, f
H, heart rate
- MABP
mean arterial blood pressure
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P
b
blood pressure(s)
- TPR
total peripheral resistance
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V
b
cardiac output |
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Keywords: | Diving Blood pressure Peripheral resistance Blood flow distribution Tufted duck Aythya fuligula |
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