The effect of endurance training on exercise capacity following cardiac resynchronization therapy in chronic heart failure patients: a pilot trial

Abstract

Background

Both endurance training (ET) and cardiac resynchronization therapy (CRT) improve quality of life (QOL) and exercise tolerance in patients with advanced chronic heart failure (CHF).

Design

A randomized intervention trial to study the effect on exercise capacity of ET in addition to CRT in patients with CHF and dyssynchrony.

Methods

Seventeen patients (eight men, aged 59 ± 9 years) with CHF and dyssynchrony were randomized to CRT with (n = 8) or without (n = 9) ET and compared with two matched control CHF groups (standard care with ET: n = 9, standard care only: n = 10). At baseline and after 5 months, exercise tolerance, left ventricular (LV) remodelling, QOL and NT-pro brain natriuretic peptide (NT-proBNP) levels were assessed.

Results

Peak oxygen consumption (VO₂peak), maximal workload (Wattmax), circulatory power, LV ejection fraction, dyssynchrony and QOL improved in both CRT groups. However, the increase in VO₂peak (+ 40% versus +16%, P = 0.005), Wattmax (+ 43% versus +13%, P = 0.0005), and circulatory power (+ 74% versus + 32%, P = 0.01), was significantly greater in the trained versus the untrained CRT patients. Comparison of the four patient groups confirmed the cumulative effects of CRT plus ET.

Conclusions

ET in resynchronized CHF patients is feasible and further enhances exercise tolerance. Patients with severe CHF should be prescribed an exercise training programme after implantation in order to maximize the expected benefit. Eur J Cardiovasc Prev Rehabil 14: 99-106 © 2007 The European Society of Cardiology

Keywords

cardiac resynchronization therapy chronic heart failure exercise capacity exercise training

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