The Effect Of Aerobic Exercise On Patients With Chronic Heart Failure

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Literature review; The effect of aerobic exercise on VO2 max in patients with chronic heart failure. Patients suffering from chronic heart failure (CHF) often suffer from a decreased aerobic exercise capacity and exercise intolerance, which leads to a progressive deterioration in functional capacity (Belardinelli et al. 1999). This review will focus on four controlled clinical studies which have examined the effect of exercise training on VO2 max in patients with CHF. Coats et al. (1992) compared a phase of normal activity to a training period in a group of patients to assess if there was an improvement in VO2 max due to exercise compared to rest. A group of seventeen men over 60 years of age with moderate to severe chronic heart failure (NYHA class II-III) and a left ventricular ejection fraction of 19.6 ± 2.3% took part in a controlled crossover trial consisting of an exercise phase and a resting phase. During the exercise phase the participants exercised for 8 weeks on a training bicycle at 50RPM for 20 minutes a day at 60-80% of their maximum heart rate for five days per week. The patients undertook exercise testing to calculate VO2 max before and after each phase. An overall mean compliance to exercise was calculated to be 77.3% using a revolution counter installed on each bike. The exercise phase showed a significant increase in VO2 max (13.2 ± 0.9 to 15.6 ± 1.0 ml/kg/min) when compared with controls in this study. No significant difference was observed between
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