2002 OPEN FORUM Abstracts
THE INFLUENCE OF FEV1% OF PREDICTED ON EXERCISE TOLERANCE IN OLDER ADULTS WITH CHRONIC OBSTRUCTIVE PULMONARY DISEASE PARTICIPATING IN PULMONARY REHABILITATION
Sidney R Schneider PhD RRT RPFT, Robert L Joyner PhD RRT, Susan M Muller PhD, Jeanne E Ruff MS, Salisbury University and Peninsula Regional Medical Center, Salisbury, MD
Background: The FEV1% of predicted is frequently used to determine severity of disease in chronic obstructive pulmonary disease. The purpose of this study was to determine the impact of severity of disease, as measured by FEV1% of predicted, on exercise tolerance in older adults with COPD completing a pulmonary rehabilitation (PR) program.
Methods: A retrospective study was conducted to examine exercise tolerance records (comparing initial and final sessions) of 57 adults, 59 to 81 years of age (mean ± SD = 69.4 ± 6.1 years), 29 females and 28 males, with COPD grouped according to severity of disease (mild, n = 21; moderate-severe, n = 36) based on FEV1% of predicted, that completed 36 one-hour exercise sessions in an outpatient PR program (time to completion Mean ± SD = 4.17 ± 1.52 months.).
Results: Analysis by repeated measures ANOVA found improved exercise tolerance within subjects (p = < 0.05) for both groups for treadmill workload (mph), treadmill time (min.), stationary cycling workload (by level), cycling time (min.) and 6-minute Walk (mph). The groups differed only on the 6-minute Walk (p = < 0.05). There were no differences in O2 saturation, rate of perceived exertion, dyspnea rating, body weight, or months to completion. Differences between groups (paired t-tests, p = < 0.05) were found for FEV1, FEV1% of predicted, FEV1/FVC ratio, FEF25-75, FEF25-75%, but not age.
Conclusion: Improvements in exercise tolerance in older adults participating in PR were found across severity of COPD. However, grouping subjects by FEV1% of predicted failed to differentiate improvements in exercise tolerance between groups for all measured parameters of exercise tolerance, except for the 6-minute walk. This may suggest that other factors have a greater influence on exercise tolerance in exercising older adults with COPD.