The effect of exhaustive exercise training on resting oxygen consumption and post-exercise oxygen consumption rate in southern catfish ( Silurus meridionalis chen)

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The resting oxygen consumption rate ( VO 2rest) and post-exercise VO 2 in southern catfish fed on maintenance rations (1.5% body mass per day) or fasted during 15 d of exhaustive exercise training (5 min chasing) and a subsequent 5 d without training was investigated at 25 °C. Two groups kept under the same conditions without exercise training acted as feeding and fasting controls. The VO 2rest values of both feeding and fasting controls decreased significantly during the experiment ( p < 0.05), while those of the feeding and fasting training groups were significantly increased after 15 d of training ( p < 0.05). VO 2rest of both training groups decreased significantly to control levels after training was stopped. The VO 2peak values of both feeding and fasting controls decreased significantly during the experiment ( p < 0.05), while those of the feeding and fasting training groups were unchanged after 15 d of training ( p < 0.05). VO 2peak of both training groups decreased significantly to control levels after training was stopped. There were no significant differences in either VO 2peak/ VO 2rest or excess post-exercise VO 2 (EPOC) among any groups. It is suggested that: (1) VO 2rest and VO 2peak were significantly improved by exercise training compared with the control groups, but returned to their previous values 5 d after stopping training; (2) post-exercise VO 2 recovered faster in training groups compared with control groups, and this trait persisted 5 d after stopping training; (3) training had similar physiological effects on feeding and fasting southern catfish, except that VO 2rest was more sensitive to training in the fasting group; (4) the main effect of training on the post-exercise VO 2 recovery process was the shape of post-exercise VO 2 curve rather than the EPOC.