Cardiorespiratory optimal point: a submaximal exercise variable to assess panic disorder patients.

Area of Science:

• Cardiology
• Psychiatry
• Exercise Physiology

Background:

• Panic disorder (PD) patients frequently experience respiratory symptoms and exhibit reduced performance during maximal cardiopulmonary exercise testing (CPX).
• Phobic anxiety is a potential contributing factor to poor exercise performance in PD patients.
• The cardiorespiratory optimal point (COP), a submaximal exercise variable (minimum VE/VO2), may offer a valuable clinical assessment tool.

Purpose of the Study:

• To investigate the utility of the cardiorespiratory optimal point (COP) in assessing panic disorder (PD) patients.
• To compare cardiorespiratory parameters between PD patients and a healthy control group.
• To evaluate COP differences between PD patients who completed maximal versus submaximal CPX.

Main Methods:

• Retrospective analysis of data from 2,338 subjects, identifying 52 PD patients (PDG).
• Matched PDG with a healthy control group (CG) based on age and gender.
• Compared COP, VO2 max, and maximum heart rate (HR max) between PDG and CG, and between PD subgroups (maximal vs. submaximal CPX).

Main Results:

• COP was similar between PDG and CG (21.9±0.5 vs. 23.4±0.6; p=0.07).
• COP did not differ between maximal and submaximal CPX subgroups within PDG (22.0±0.5 vs. 21.6±1.3; p=0.746).
• PD patients completing maximal CPX showed similar VO2 max (32.9±1.57 vs 29.6±1.48; p=0.145) and HR max (173±2.0 vs 168±2.7; p=0.178) compared to controls.

Conclusions:

• Cardiopulmonary exercise testing (CPX) is clinically safe for PD patients.
• The cardiorespiratory optimal point (COP) indicates normal cardiorespiratory interaction at submaximal exercise levels in PD patients.
• COP assessment can help alleviate patient and physician concerns regarding exercise-induced respiratory symptoms in PD.