Low-load blood flow restriction strength training in patients with COPD: a randomised single-blind pilot study.

OBJECTIVE: The objective of this study is to compare the effectiveness of lower limb low-load blood flow restriction training (LL-BFRT) with high-load strength training (HL-ST) as part of an outpatient pulmonary rehabilitation programme on leg strength in patients with chronic obstructive pulmonary disease (COPD). METHODS: Participants were randomised to LL-BFRT or HL-ST (24 sessions). LL-BFRT was done at 30% 1-repetition maximum (1-RM) with 70% arterial occlusion pressure. HL-ST was done at 70% 1-RM. Primary outcome was isometric strength of knee extensors and flexors. Secondary outcomes were 1-RM, functional exercise capacity, physical activity, symptom burden and health-related quality of life. Perceptions of dyspnoea and leg fatigue were recorded after every exercise. We compared groups with t-tests. RESULTS: We included 30 participants (13 women, 17 men, 64 (9) years, forced expiratory volume in 1 s 47 (18)% pred.), 24 completed the study. Isometric knee extensor strength improved to a clinically relevant degree in both legs in both groups (LL-BFRT: right leg 9 (20) Nm, left leg 10 (18) Nm; HL-ST: right leg 15 (26) Nm, left leg 16 (30) Nm, data are mean (SD)), without statistically significant or clinically relevant between-group differences (right leg mean difference= -6.4, 95% CI= -13.20 to 25.92 Nm, left leg mean difference= -5.6, 95% CI= -15.44 to 26.55 Nm). 1 min sit-to-stand test performance improved to a clinically relevant degree only in the LL-BFRT group (4 (4) vs 1 (5) repetitions). Interestingly, physical activity improved to a clinically relevant degree only in the LL-BFRT group (1506 (2441) vs -182 (1971) steps/day). LL-BFRT lowered perceived in-exercise dyspnoea and increased leg fatigue compared with HL-ST in the initial 12 trainings. CONCLUSION: In patients with stable COPD undergoing outpatient pulmonary rehabilitation, LL-BFRT was not superior to HL-ST in improving leg strength. LL-BFRT led to similar strength gains as HL-ST while reducing perceptions of dyspnoea in the initial training phase. TRIAL REGISTRATION NUMBER: NCT04151771.

Acceptability, Appropriateness and Feasibility of a Nurse-Led Integrated Care Intervention for Patients with Severe Exacerbation of COPD from the Healthcare Professional's Perspective - A Mixed Method Study.

Purpose: To improve inpatient care and self-management in patients with severe acute exacerbations of COPD, we implemented a nurse-led behavioral intervention. This study aimed to assess implementation outcomes from the perspective of the healthcare professionals (HCP) who delivered it. Methods: Using an explanatory sequential mixed method approach, we conducted an online questionnaire and two small group interviews. We applied descriptive statistics for quantitative data, a framework analysis for qualitative data, and a mixed methods matrix to integrate the results. Results: A total of 19 of 27 invited participants answered the online questionnaire; 9 of 19 participated in the group interviews. The intervention's overall acceptability, appropriateness, and feasibility was rated high to very high (median 5/5; 4/5 and 4/5). Enablers to implementation included general recognition of the need for specialized care, sufficient knowledge of the intervention by HCP, and strong interprofessional collaboration. Main barriers included the lack of resident physician's resources and difficulties in adaptability. Conclusion: While the acceptance of the intervention was very high, the perceived appropriateness and feasibility were affected by its complexity. The availability of a knowledgeable interprofessional core team is a strategy that supports the implementation of complex interventions.