Abstract
Effects of feeding on pre-exercise VO2 and excess post-exercise oxygen consumption (EPOC) after exhaustive exercise were investigated in sedentary southern catfish, active herbivorous grass carp, omnivorous crucian carp, and sluggish omnivorous darkbarbel catfish to test whether feeding had different effects on EPOC and to compare EPOC in fishes with different ecological habits. For fasting fish, the pre-exercise and peak post-exercise VO2 were higher and recovery rates were faster in crucian carp and grass carp compared to those of darkbarbel catfish and southern catfish. EPOC magnitudes of grass carp and southern catfish were significantly larger than those of crucian carp and darkbarbel catfish. Feeding had no significant effect on peak post-exercise VO2, recovery rate, and EPOC magnitude in grass carp. Both the pre-exercise and peak post-exercise VO2 increased with meal size, while the EPOC magnitude and duration decreased significantly in the larger meal size groups of crucian carp and southern catfish. In darkbarbel catfish, both the pre-exercise and peak post-exercise VO2 increased with meal size, but the VO2 increment elicited by exercise was larger in feeding groups compared with the fasting group. These results suggest that (1) the characteristics of the post-exercise VO2 profile, such as peak post-exercise VO2 and recovery rate, were closely related to the activity of fishes, whereas the EPOC magnitude was not and (2) the effects of feeding on EPOC were more closely related to the postprandial increase in VO2.
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This study was funded by the National Science Foundation of China (NSFC 30700087), the Chongqing Science and Technology Commission (CSTC 2007BB1226), and the Research Project of Chongqing Education Committee (KJ080823). We declare that the experiments comply with the current laws of the country in which the experiments were performed.
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Communicated by G. Heldmaier.
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Fu, SJ., Zeng, LQ., Li, XM. et al. Effect of meal size on excess post-exercise oxygen consumption in fishes with different locomotive and digestive performance. J Comp Physiol B 179, 509–517 (2009). https://doi.org/10.1007/s00360-008-0337-x
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DOI: https://doi.org/10.1007/s00360-008-0337-x