Importance of the exercise programme for the assessment of functional capacity after myocardial infarction

Abstract

To evaluate the effect of different bicycle exercise programmes on estimates of functional capacity in cardiac patients, the cumulated exercise capacity, physiologic and gas exchange responses were measured in eleven men 5-10 weeks after an acute myocardial infarction. The patients were not limited by angina and all were treated with a beta-blocker. On separate days and in randomized order the patients performed symptom-limited cardiopulmonary exercise testing on 50W/3min stage, 50 W/6min stage and continuous ‘ramp’ (15 W per min) programmes. Submaximal and peak oxygen consumption, peak heart rate, rate pressure product, workload and minute ventilation were independent of the various exercise programmes, but exercise time and maximal cumulated exercise capacity (workload × time integral) were significantly higher on the 50W/6min stage (50.3 ±20.0kJ) and ramp (41.1 ± 16.4kJ) programmes compared to the 50W/3min stage programme (32.8 ± 11.9kJ).

The variation of exercise time and cumulated work capacity, but not oxygen consumption between different exercise programmes has to be considered when estimating functional capacity early after acute myocardial infarction.

Key Words:

• acute myocardial infarction
• exercise capacity
• exercise testing methods