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. Author manuscript; available in PMC: 2015 Nov 1.
Published in final edited form as: Am J Geriatr Psychiatry. 2013 Jul 23;22(11):1210–1221. doi: 10.1016/j.jagp.2013.04.002

Figure 1.

Figure 1

Cardiac Measurement over the Psychophysiology Experimental Protocol

Note. † There were two sets of baseline variables (i.e., Baseline 1 and Baseline 2) within 11 minutes, each representing a 5 minutes epoch.

*Task 1 and Task 2 could be Math or Stroop task. The sequence of the two mental stress tasks was varied by participants. Regardless, there was a recovery period (6 minutes) between two tasks to avoid the influence of Task 1 on Task 2. In addition, there were 26 participants attending PASAT task instead of Math task (data was not shown). For the purpose of illustration, we recoded data and displayed the graphs (b and c) on HR, LF HRV, and HF HRV based on the type of mental stress task (Math or Stroop task) instead of the order of the task (Task 1 or 2).