Fig. 1. BRS, SBP, DBP, and HR responses to the cold pressor and speech stressors in the severe CFS (N = 15), less severe CFS (N = 16), and control (N = 29) groups. Both stressors elicited significant increases in SBP and DBP (p values <.0001). HR increased and BRS declined during the speech task (p values <.0001) but remained unchanged during the cold pressor test.

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