Depression symptoms predict heart rate recovery after treadmill stress testing

Area of Science:

• Cardiology
• Psychiatry
• Autonomic Nervous System Research

Background:

• Autonomic nervous system (ANS) dysfunction may link depression and cardiac mortality.
• Heart rate (HR) recovery post-treadmill stress test indicates ANS function and predicts mortality.
• This study investigated depression symptoms and HR recovery in cardiac rehabilitation patients.

Purpose of the Study:

• To examine the relationship between depression symptoms and heart rate recovery.
• To understand the role of ANS functioning in patients undergoing cardiac rehabilitation.

Main Methods:

• Assessed 260 patients at cardiac rehabilitation enrollment.
• Utilized treadmill stress tests for exercise capacity and HR recovery (2-min post-exercise).
• Measured depression symptoms with the Beck Depression Inventory; collected medical data via chart review.

Main Results:

• Higher Beck Depression Inventory scores correlated with slower HR recovery.
• This association persisted after adjusting for age, sex, and beta-blocker use.
• Exercise capacity mediated the relationship, rendering it non-significant when controlled.

Conclusions:

• Depression is associated with autonomic nervous system (ANS) dysregulation.
• Impaired exercise capacity is implicated as a potential mechanism linking depression and ANS dysfunction.
• Findings emphasize the importance of assessing both depression and exercise capacity in cardiac patients.