Maximum Intensity Exercise Training in Patients with Chronic Obstructive Pulmonary Disease (8)
The limitations to maximum exercise tests are presented in Table 2. At baseline, dyspnea was the most common limiting symptom reported in 36 out of 52 patients (69 percent), followed by muscle symptoms in 16 out of 52 patients (31 percent). After rehabilitation, dyspnea also was the most common limiting symptom reported (65 percent), followed by muscle symptoms (26 percent).
In order to assess progress during training, the work load and duration during supervised treadmill exercise sessions were obtained from each patients training diary at weeks 1,4 and 8 of the rehabilitation program. In addition, the training Vo2, Ve and HR at week 8 were estimated from measurements obtained at the corresponding work load during the post-rehabilitation incremental exercise test performed near that time. The percentages of baseline maximum work load (in METs) for the target level of the endurance exercise test, as well as for training weeks 1, 4 and 8, are plemental oxygen at rest or exercise, or both. After rehabilitation, exercise tolerance improved with a significant increase in maximal treadmill work load (estimated Vo2 in METs), Vo2max, and VEmax and a decrease in perceived breathlessness and fatigue. There was no significant change in maximum HR or in Vo2 at AT (for the 18 subjects who showed evidence of reaching AT at baseline).
Table 2—Limitations to Maximum Exercise
|Limitation||Baseline (n = 52)||After Rehabilitation (n = 46)|
|Dyspnea and muscle||5||5|
|Dyspnea and other*||5||3|
|Muscle and other*||1||2|