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. Author manuscript; available in PMC: 2011 Jun 15.
Published in final edited form as: Biol Psychiatry. 2010 Mar 17;67(12):1185–1190. doi: 10.1016/j.biopsych.2010.02.001

Figure 1. Schematic of Experiment.

Figure 1

Each subject (N=33 artifact-free data) participated in four laboratory sessions during which we recorded ECG and subsequently calculated heart rate variability, a measure of sympathetic dominance. These included two five-minute sessions (neutral and emotional challenge) separated by 24-hour ambulatory recording. Session order (a versus b) was counterbalanced between subjects. Following laboratory sessions, subjects participated in a first-time tandem skydive, to determine the degree to which laboratory ECG predicted autonomic response to an acute emotional stressor.