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Fig. 4. Effect of hypoxic preconditioning (5 min of severe hypoxia) on the loss of
cardiac output (
) during a subsequent
30 min hypoxic exposure (N=78 in each group): 5 min of
hypoxic-preconditioning (filled squares); 30 min of severe hypoxia (filled
circles); and 30 min of severe hypoxia following 5 min of hypoxic
preconditioning (open squares). Repeated-measures ANOVA indicated that
pre-exposure to 5 min of hypoxia did not affect the rate at which
fell when hearts were exposed to 30
min of severe hypoxia. Values are means ± S.E.M.