Impact of exercise training on cognitive function in patients with COPD: a systematic review and meta-analysis of randomised controlled trials
Bibliographic record
Abstract
Objective The aim of this study was to describe the characteristics of exercise therapies in randomised controlled trials (RCTs) targeted at improving cognitive function and to assess their efficacy in COPD. Methods We conducted a comprehensive search of eight databases, namely PubMed, Web of Science, Embase, Cochrane Library, Chinese Biomedical Literature Database, China National Knowledge Infrastructure, Wanfang and Weipu, covering the period from database construction to 23 April 2024. Our search specifically targeted RCTs studying the effects of exercise on cognitive functioning in COPD patients. Trials consisted of one or more exercise training interventions along with at least one cognitive outcome study. Two reviewers independently reviewed papers, extracted data and evaluated the research literature's quality using the Cochrane risk-of-bias assessment tool RoB 2.0 and the modified Jadad scale. Meta-analysis of Montreal Cognitive Assessment (MoCA) scores in the groups with and without exercise intervention was performed and subgroup analyses were undertaken to identify potential causes of heterogeneity. Results We included a total of nine studies that included 578 COPD patients (69% male). Each study demonstrated that patients improved significantly in at least one cognitive component following training. All current research focuses on attention, executive function, motor ability, mental capacity, verbal fluency, visuoconstructive abilities and memory. The results revealed that exercise significantly improved MoCA scores in COPD patients (standardised mean difference (SMD) 0.576 (95% CI 0.054–1.097); p=0.029). A subgroup analysis of the duration of each intervention revealed that exercise training with an intervention duration of >30 min significantly improved overall cognitive performance in COPD patients (SMD 0.499 (95% CI −0.165–1.163); p=0.000, I 2 =0.0%). A subgroup analysis of varied intervention durations revealed that 4 weeks of exercise training significantly improved overall cognitive performance in COPD patients (SMD 0.202 (95% CI −0.238–0.641); p=0.000, I 2 =0.0%). In addition, just one study had a year-long follow-up period. Conclusion Participation in exercise training, whether aerobic exercise alone or in combination with resistance or muscular strength, healthy qigong, dance or breathing exercises, can improve cognitive performance to varying degrees in people with COPD. Nonetheless, the findings should be regarded with caution due to the limitations of the included studies.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.016 | 0.016 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.054 | 0.011 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; both teacher heads agree on what is shown here.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".