Cardiac autonomic function: HRV We noted a nonsignificant trend toward increase in CVNN following HRV biofeedback training compared to baseline and control, both under resting conditions ( Figure 1 ) and under paced breathing ( Figure 2 ).
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Heart rate variability biofeedback in patients with alcohol dependence: a randomized controlled study.
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First, the observed increase in HRV did not reach statistical significance.