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The metabolic responses and acid–base status after feeding, exhaustive exercise, and both feeding and exhaustive exercise in Chinese catfish (Silurus asotus Linnaeus)

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The metabolic responses and acid–base status after feeding, exhaustive exercise, and both feeding and exhaustive exercise in Chinese catfish (Silurus asotus Linnaeus)

Content Provider	Springer Nature Link
Author	Li, Ke Gui Cao, Zhen Dong Peng, Jiang Lan Fu, Shi Jian
Copyright Year	2010
Abstract	Feeding and exhaustive exercise are known to elevate metabolism. However, acid–base status may be oppositely affected by the two processes. In this study, we first investigated the acid–base response of Chinese catfish to feeding (the meal size was about 8% of body mass) to test whether an alkaline tide (a metabolic alkalosis created by gastric HCl secretion after feeding) would occur. We then determined the combined effects of feeding and exhaustive exercise on excess post-exercise oxygen consumption and acid–base status to determine whether the alkaline tide induced by feeding protects against acid–base disturbance during exhaustive exercise and affects subsequent recovery. Arterial blood pH increased from 7.74 ± 0.02 before feeding to 7.88 ± 0.02 and plasma [HCO3 −]pl increased from 5.42 ± 0.29 to 7.83 ± 0.37 mmol L−1 6 h after feeding, while feeding had no significant effect on $$ P_{{{\text{CO}}_{2} }} $$ . Exhaustive exercise led to a significant reduction in pH by 0.46 units and a reduction of [HCO3 −]pl by ~3 mmol L−1. Lactate concentrations in white muscle and plasma increased by 2.4 mmol L−1 and 13.4 μmol g−1, respectively. Fed fish had a higher pH and [HCO3 −]pl than fasting fish at rest, and the reductions in pH (0.36 units) and [HCO3 −]pl (~2 mmol L−1) were thus lower after exhaustive exercise. However, the recovery of acid–base status and metabolites were similar in digesting and fasting fish. Overall, a significant alkaline tide was found in Chinese catfish after feeding. The alkaline tide elicited by feeding significantly prevented the decreases in pH and [HCO3 −]pl immediately after exhaustive exercise, but recovery from exhaustive exercise was not affected by digestion.
Starting Page	661
Ending Page	671
Page Count	11
File Format	PDF
ISSN	01741578
Journal	Journal of Comparative Physiology B
Volume Number	180
Issue Number	5
e-ISSN	1432136X
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-02-02
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Acid–base status Exhaustive exercise Excess post-exercise oxygen consumption Feeding Specific dynamic action Animal Physiology Biomedicine general Zoology Human Physiology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Physiology Biochemistry Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Endocrinology

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