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Fig. 5. Effect of hypoxic preconditioning (5 min of severe hypoxia) on the recovery of maximum cardiac performance of in situ rainbow trout hearts exposed to 30 min. of severe hypoxia (N=7–8 in each group). (A) Comparison of maximum cardiac performance at max1 and max2. (B) The percentage change in cardiac performance, max2 relative to max1. *Significant difference (P<0.05), as determined using repeated-measures ANOVA. Dissimilar letters represent a significant difference (P<0.05) between treatment groups, as determined using one-way ANOVA. Values are presented as means ± S.E.M.