05/15/2002 By Robert Short
Physical training improves the functional capacity and quality of life of patients with heart failure. This was the finding of a three-week controlled randomized trial in Germany comparing a steady-state exercise training method and an interval training method. Twenty subjects were randomized to a steady-state exercise regimen, twenty to an interval training regimen, and ten subjects served as controls. Quality of life was found to improve (according to the SF-36 questionnaire) in both training groups. However, the psychological sum factor was three times as high in the steady-state exercise group. In the continuous-exercise group, VO2 at the anaerobic threshold and at maximal exercise increased 13.7 per cent and 9.3 per cent respectively. In the interval training group, the increase was 14 per cent and 8.1 per cent respectively. After interval training, a significant increase at maximal exercise could be seen in cardiac index and stroke volume index, with a concomitant drop in systemic peripheral resistance compared to the steady-state method. Interval training was characterized by a higher short-term workload, but lower mean work load with a significantly smaller increase in lactate.
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