Fig. 5.

Analysis of heart rate variability in WT (●), surviving Pet-1^−/− animals (○), and dying Pet-1^−/− animals (grey circles) within the low frequency (LF; A), high frequency (HF) domains (B), as well as their ratio (LF/HF; C). Shown are data for each individual animal (all circles) and group averages (□) during normoxic prechallenge conditions (baseline) and following the first episode of anoxia (postanoxia). au, Arbitrary units. *P < 0.05, significant difference in the change in LF, HF, and LF/HF from baseline to postanoxia in dying Pet-1^−/− animals compared with surviving animals.