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  • Title: The effect of exercise training on the metabolic interaction between digestion and locomotion in juvenile darkbarbel catfish (Peltebagrus vachelli).
    Author: Li XM, Cao ZD, Peng JL, Fu SJ.
    Journal: Comp Biochem Physiol A Mol Integr Physiol; 2010 May; 156(1):67-73. PubMed ID: 20138236.
    Abstract:
    To examine the effects of exercise training on the metabolic interaction between digestion and locomotion in juvenile darkbarbel catfish (Peltebagrus vachelli) (5.58+/-0.04 g), the postprandial metabolic response, critical swimming speeds (U(crit)) and oxygen consumption rates (VO(2)) during swimming were measured on fish held at a constant temperature (25 degrees C). Fish were fed a diet of cutlets of freshly killed loach. Fish in the trained group were forced to swim at 60% U(crit) for 50 min followed by an exhaustive 10-min chase once daily for 21 days. Exercise training did not produce significant differences in resting VO(2) (VO(2rest)) and postprandial peak VO(2) (VO(2peak)) compared to the non-trained groups. However, exercise training elicited a significant decrease in both the duration and energy expenditure of digestion when fed with similar food (P<0.05). Feeding had no significant effect on U(crit) of non-trained fish, while it caused a significantly lower U(crit) (compared to fasting fish) in trained fish (P<0.05). Training resulted in a significantly higher U(crit) and active VO(2) (VO(2active)) in fasting fish when fish swam at U(crit). However, training had no effect on either the U(crit) or VO(2active) of post-feeding fish. Our results suggest that: (1) the central cardio-respiratory systems of non-trained darkbarbel catfish can support the oxygen demands of both digestion and the locomotion simultaneously; (2) the metabolic mode of competition in darkbarbel catfish is flexible; it changed from an additive model to a digestion-priority model after exercise training; (3) training may be accounted for cardio-respiratory capacity increase and following improvement of swimming performance during fasting in darkbarbel catfish, although, the swimming capacity was sacrificed to digestion in the situation of postprandial locomotion.
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