Sustainability of Rehabilitation Gains in COPD

慢性阻塞性肺病康复成果的可持续性

• 批准号: 8782898
• 负责人: Eileen G Collins
• 金额: --
• 依托单位: EDWARD HINES JR VA HOSPITAL
• 依托单位国家: 美国
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-10-01 至 2018-09-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8782898
• 关键词: Adherence; Affect; Anxiety; Breathing; Breathing Exercises; Cause of Death; Chronic; Chronic Obstructive Airway Disease; Clinical; Development; Diagnosis; Dimensions; Dyspnea; Effectiveness; Enrollment; Ensure; Exercise; Exercise Tolerance; Exhalation; Fatigue; General Population; Health; Health Care Costs; Home environment; Hospitalization; Impairment; Intention; Intervention; Laboratories; Linear Regressions; Maintenance; Measurement; Measures; Mental Depression; Methods; Modeling; Muscle function; Outcome Measure; Participant; Patient Education; Patients; Pattern; Physical activity; Physicians; Physiological; Psychological Factors; Pulmonary function tests; Qualifying; Quality of life; Randomized; Randomized Controlled Clinical Trials; Rehabilitation therapy; Reporting; Research; Respiratory Muscles; Risk; Sampling; Self Efficacy; Severities; Study Subject; Symptoms; Tail; Techniques; Telephone; Testing; Time; Training; Treadmill Tests; Ultrasonography; United States; Veterans; Visit; Walking; Work; airway obstruction; base; clinical phenotype; design; disability; follow-up; functional decline; functional status; health administration; improved; interest; intervention program; mortality; motivational enhancement therapy; muscle strength; novel; primary outcome; programs; psychologic; public health relevance; pulmonary rehabilitation; quadriceps muscle; respiratory; study characteristics

DESCRIPTION (provided by applicant): Rationale: Development of dynamic hyperinflation is a primary limiting factor of exercise tolerance in chronic obstructive pulmonary disease (COPD). To lessen the development of dynamic hyperinflation, and to improve exercise tolerance in COPD patients, we have developed a breathing- retraining technique to be used during pulmonary rehabilitation. This breathing-retraining technique is designed to decrease respiratory rate and prolong exhalation. We demonstrated that, in the short- term, hyperinflation and exercise duration improved more with breathing-retraining plus exercise- training than with exercise-training alone. Because a crucial aspect of pulmonary rehabilitation is the maintenance its short-term benefits over the long-term, we now propose to test whether short- term benefits of breathing-retraining plus exercise followed by an adherence-intervention program are sustainable over the long-term Primary Hypothesis: (H1) In COPD patients, improvements in exercise duration on a constant- load treadmill test will be greater after 12 weeks of breathing- retraining plus exercise-training followed by a 42-week adherence-intervention program (1 yr. total) than after 12 weeks of exercise-training alone followed by a 42-week adherence-intervention program (1 yr. total). Secondary Hypotheses: One year after randomization, exercise-induced dynamic hyperinflation will be less during a constant-load treadmill test (H2), 6-minute walking distance will be longer (H3), and mastery over breathing will be greater (H4) in the breathing- retraining plus exercise-training group than in the exercise-alone group. Lastly (exploratory objective), we will assess the effect of the patient's physiologic, psychologic and clinical phenotype on short-term and long-term responsiveness to pulmonary rehabilitation. Methods: The proposed study is a randomized, controlled clinical trial in which 250 patients with moderate-to-severe COPD will be enrolled. One hundred forty of these patients are expected to qualify for randomization into the breathing-retraining plus exercise-training group or the exercise-training alone group. Patients will receive 12-weeks of supervised training according to group assignment (three times weekly) followed by an adherence-intervention program (weekly phone motivational interviews, home-exercise program, and monthly laboratory booster sessions). Follow-up testing will be completed at 12 weeks, and at 6 and 12 months. Testing will include pulmonary function test, incremental-load and constant-load treadmill tests, 6-minute walk test, measurements of dyspnea, assessment of respiratory and quadriceps muscle strength and endurance and quadriceps ultrasonography. Analysis: In the principal analysis of the primary outcome measure (exercise duration; H1) we will compare changes in exercise duration (constant work-rate treadmill test) from baseline to end of study using 2-sample t-test (two-tailed ¿=.05). The primary analysis will be based on intention-to-treat principles. Multiple imputation will be used for study subjects missing the 12-month measurement. This imputation model will be based on baseline characteristics of study participants. Several secondary analyses of the primary outcome measure will be performed (H2-H4). Linear regression will be used to determine whether the observed treatment benefits persist after adjustment for baseline covariates and measures of adherence to treatment. Since several measurements will be taken on each patient, mixed-models analysis will be used to compare the changes on the constant- load treadmill test over time between the two groups.

描述（由申请人提供）：