Is strength training the more efficient training modality in chronic heart failure?

Area of Science:

• Cardiology
• Exercise Physiology
• Rehabilitation Medicine

Background:

• Peripheral muscle atrophy and weakness are key limitations in patients with severe chronic heart failure (CHF).
• The role of exclusive strength training (ST) versus endurance training (ET) and combined training (CT) in CHF requires further investigation.

Purpose of the Study:

• To compare the effects of exclusive strength training (ST) with conventional endurance training (ET) and combined training (CT) in patients with severe CHF.
• To test the hypothesis that ST is at least as effective as ET or CT in improving exercise capacity and muscle function in CHF patients.

Main Methods:

• A randomized controlled study involving three intervention groups (ST, ET, CT) and a control group, each with 15 patients.
• Intervention consisted of 40 sessions over 12 weeks, with assessments including left ventricular ejection fraction (LVEF), peak oxygen consumption (VO2peak), and muscle strength.
• Key outcome measures were LVEF, VO2peak, peak workload, thigh muscle volume, knee extensor strength and endurance, and quality of life (QoL).

Main Results:

• All training modalities significantly improved most measured parameters compared to the control group.
• VO2peak, peak workload, thigh muscle volume, and knee extensor endurance showed statistically significant improvements across all training groups versus control.
• No single training modality demonstrated superiority over others, though minor differences were observed. Knee extensor strength, LVEF, and QoL did not reach statistical significance.

Conclusions:

• Intensive exercise training, regardless of modality, effectively enhances cardiac function, exercise capacity, peripheral muscle function, and quality of life in CHF patients.
• Strength training, endurance training, and combined training are all beneficial for improving outcomes in severe chronic heart failure.