Evaluation of six-minute walk distance with and without pursed lip breathing in patients with chronic obstructive pulmonary disease

Background: Chronic obstructive pulmonary disease limits exercise capacity because airways collapse early during expiration and air becomes trapped in the lungs. Pursed lip breathing is a simple technique that may reduce this problem during exertion. Objective: To compare the six-minute walk distance of patients with chronic obstructive pulmonary disease with and without pursed lip breathing. Methods: Fifty-eight diagnosed patients aged 45 to 75 years with mild breathlessness completed the six-minute walk test on two consecutive days, first with normal breathing and then with pursed lip breathing. Distances in meters were compared using the Wilcoxon signed-rank test. Results: The mean walk distance rose from 448.79 meters (standard deviation 59.48) without pursed lip breathing to 461.36 meters (standard deviation 58.81) with it, a mean gain of 12.57 meters. All 58 patients walked farther with pursed lip breathing (Wilcoxon Z of minus 6.70, p below 0.001). Conclusion: Pursed lip breathing produced a small but highly consistent improvement in walk distance. Because the test order was fixed, the result needs confirmation in randomized, counterbalanced trials.