Effect of fasting on the V ˙ O2-fh relationship in king penguins
dytes patagonicus) may fast for up to 30 days during their breeding period. As such extended fasting may affect the relationship between the rate of O2 consumption (V ˙ O2) and heart rate (fH), five male king penguins were exercised at various speeds on repeated occasions during a fasting period of...
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| Format: | Text |
| Language: | English |
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2003
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.554.7882 http://www.zoology.ubc.ca/~fahlman/pub-link/penguins/Treadmill fasting-AJP-2004/Fahlman-AmJP-287-R879-877-2004.pdf |
| Summary: | dytes patagonicus) may fast for up to 30 days during their breeding period. As such extended fasting may affect the relationship between the rate of O2 consumption (V ˙ O2) and heart rate (fH), five male king penguins were exercised at various speeds on repeated occasions during a fasting period of 24–31 days. In addition, V ˙ O2 and fH were measured in the same animals during rest in cold air and water (4°C). V ˙ O2 and fH at rest and V ˙ O2 during exercise decreased with fasting. There was a significant relation between V ˙ O2 and fH (r2 0.56) that was improved by including speed, body mass (Mb), number of days fasting (t), and a cross term between fH and t (r2 0.92). It was concluded that there was a significant change in the V ˙ O2-fH relation-ship with fasting during exercise. As t is measurable in the field and was shown to be significant and, therefore, a practical covariate, a regression equation for use when birds are ashore was obtained by removing speed and Mb. When this equation was used, predicted V ˙ O2 |
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