Comparison of Effects of Endurance and Strength Training Programs in Patients with COPD

Comparisons between endurance and strength training in chronic obstructive pulmonary disease (COPD) patients have produced equivocal findings when examining physical function and health-related quality of life (HRQL). One reason for these differences may be due to individual patient responses to the different training modalities. PURPOSE: To compare changes in physical function and HRQL in a group of COPD patients completing both an endurance and a strength training program. METHODS: Eleven mildly diseased patients completed a three month endurance training program and, approximately 5 years later, completed a three month strength training program. Changes in 6 minute walk distance (6 MW), time to rise from a chair five times (CRT), and the total score and subscores from the SF-36 and Chronic Respiratory Disease Questionnaire (CRQ) were examined. RESULTS: The forced expiratory volume as a percent of predicted remained relatively constant over the 5 years (61.1 +/- 5.9 vs. 60.0 +/- 10.3). Endurance and strength training increased 6 MW by 48.2 +/- 11.2 (p = 0.008) and 39.8 +/- 9.8 (p = 0.001) meters, respectively. Endurance and strength training decreased CRT by 4.8 +/- 0.7 (p = 0.001) and 1.3 +/- 1.2 (p = 0.056) seconds, respectively. Endurance training resulted in greater improvements in HRQL as compared to strength training. CONCLUSION: These results show that walk distance improves as a result of participating in either an endurance or a strength training program. However, an endurance training program leads to greater improvements in both general and disease specific measures of HRQL.