ArticleScientific reports2021
Isotonic quadriceps endurance is better associated with daily physical activity than quadriceps strength and power in COPD: an international multicentre cross-sectional trial.
Article in Scientific reports, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers, 2 of them syntheses that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
7 citing papers in PubMed, 2 syntheses or guidelines pooled it.
- Effects of exercise on muscle fatigability in COPD: a systematic review and meta-analysis.European respiratory review : an official journal of the European Respiratory Society · 2025Pooled it
- Influencing factors of sedentary behaviour in people with chronic obstructive pulmonary disease: a systematic review.BMJ open respiratory research · 2024Pooled it
- Molecular and Structural Changes, and Skeletal Muscle Strength and Endurance in Chronic Obstructive Pulmonary Disease and Interstitial Lung Disease: Practical Applications of Assessment and Management.Bioengineering (Basel, Switzerland) · 2026Review
- Diagnostic value of interferon-γ release assay in patients with COPD complicated with pulmonary tuberculosis.BMC infectious diseases · 2025Article
- Relationship between Volitional and Non-Volitional Quadriceps Muscle Endurance in Patients with Chronic Obstructive Pulmonary Disease.Diagnostics (Basel, Switzerland) · 2024Article
- Reference equations for quadriceps strength, endurance and power: a multicentre study.ERJ open research · 2023Article
- To Act or Not to Act-a Sense of Control Is Important for People With Chronic Obstructive Pulmonary Disease to Increase Physical Activity: Grounded Theory Study.JMIR formative research · 2023Article
Corrections and comments
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Authors and funding
9 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Knowledge about modifiable determinants of daily physical activity (PA) in patients with chronic obstructive pulmonary disease (COPD) is crucial to design effective PA interventions. The present study aimed to determine the contribution of quadriceps strength, power and endurance to daily PA in COPD. Additionally, for quadriceps endurance, we also aimed to determine to what extent the association varies according to the mode of movement (isotonic, isometric, or isokinetic). Using a multicentre cross-sectional trial design we determined the contribution of quadriceps function to daily PA (steps, sedentary time and time spent doing moderate-to-very-vigorous physical activity [MVPA]) using bivariate and partial Pearson correlation analysis (r) and multiple linear regression models (ΔR
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