Figure 5

Heart rate variability spectra (bin width = 0.005 Hz), on four exposure days, were truncated to place focus on activity in the low frequency range, 0.05 – 0.15 Hz of a representative RSGX (A.) and SHAM (B.) animal. Spectra were constructed from 150 s long records taken during the final episode of hypoxia on each exposure day. Note that normalized power is scaled identically for each spectrum and that levels of activity were equivalent for each animal.