Women with posttraumatic stress disorder have larger decreases in heart rate variability during stress tasks.

@article{Keary2009WomenWP,
  title={Women with posttraumatic stress disorder have larger decreases in heart rate variability during stress tasks.},
  author={Therese Anne Keary and Joel W. Hughes and Patrick A. Palmieri},
  journal={International journal of psychophysiology : official journal of the International Organization of Psychophysiology},
  year={2009},
  volume={73 3},
  pages={257-64}
}
The relationship between posttraumatic stress disorder (PTSD) and high frequency heart rate variability (HF-HRV) was investigated during a resting baseline period and two 4-minute laboratory speech tasks. Participants were 20 women with PTSD and 20 age- and gender-matched controls. Parasympathetic nervous system (PNS) cardiac control was measured as HF-HRV (0.12-0.40 Hz) using power spectrum analysis. Participants with PTSD had significantly greater reductions in HF-HRV during two speech tasks… CONTINUE READING

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