Association Between Home-Based Exercise Modality and Improvements in Exercise Capacity During Outpatient Cardiac...

Area of Science:

• Cardiology
• Exercise Physiology
• Rehabilitation Medicine

Background:

• Peak oxygen uptake (V̇O2) is a key measure of functional capacity and prognosis in cardiac rehabilitation (CR).
• Home-based exercise is crucial for outpatient CR, but the comparative effects of different exercise types on capacity are not well understood.

Purpose of the Study:

• To investigate the impact of different home-based exercise modalities (ergometer vs. walking) on exercise capacity in patients undergoing outpatient CR.
• To explore the role of exercise self-efficacy as a potential mediator in this relationship.

Main Methods:

• Retrospective observational study of 69 patients in outpatient CR.
• Cardiopulmonary exercise testing (CPET) at baseline and follow-up.
• Home exercises categorized as ergometer-based or walking-based; exercise self-efficacy assessed.

Main Results:

• Ergometer-based home exercises were independently associated with higher post-intervention peak V̇O2 (continuous outcome) after adjusting for baseline V̇O2, age, and sex.
• This association was attenuated when exercise self-efficacy changes were included in the analysis.
• A non-significant trend for a higher proportion of patients achieving ≥6% improvement in peak V̇O2 was observed in the ergometer group.

Conclusions:

• Ergometer-based home exercises may offer modest benefits for exercise capacity improvement in outpatient CR, particularly when peak V̇O2 is viewed as a continuous variable.
• While self-efficacy wasn't an independent predictor, its interaction suggests behavioral engagement is important for exercise prescription effectiveness.
• Principles of structured intensity and feedback from ergometer training could inform other home-based programs, including walking interventions.