ArticleJornal brasileiro de pneumologia : publicacao oficial da Sociedade Brasileira de Pneumologia e Tisilogia
Analysis of three different equations for predicting quadriceps femoris muscle strength in patients with COPD.
Article in Jornal brasileiro de pneumologia : publicacao oficial da Sociedade Brasileira de Pneumologia e Tisilogia. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT04201977 (Comparison of Different Forms of Recovery on the Functionality After Physical Exercise), which is not on this map. Cited by 7 papers.
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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.
The trial behind it
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.
Comparison of Different Forms of Recovery on the Functionality After Physical Exercise: Randomized Clinical Trial
Who cites it
7 citing papers in PubMed, 40 citations in OpenAlex.
- Pectoral muscle area derived from chest computed tomography to identify quadriceps muscle weakness in COPD.ERJ open research · 2025Article
- Physical Activity and Physical Function One Year After Hospital Discharge for COVID-19.Journal of clinical medicine · 2025Article
- Reference equations for quadriceps strength, endurance and power: a multicentre study.ERJ open research · 2023Article
- Prospective longitudinal evaluation of hospitalised COVID-19 survivors 3 and 12 months after discharge.ERJ open research · 2022Article
- Nutritional status and muscle dysfunction in chronic respiratory diseases: stable phase versus acute exacerbations.Journal of thoracic disease · 2018Review
- Clinical management of chronic obstructive pulmonary disease patients with muscle dysfunction.Journal of thoracic disease · 2016Review
- Assessing quadriceps muscle strength as a tool to determine the approach to and prognosis in COPD patients.Jornal brasileiro de pneumologia : publicacao oficial da Sociedade Brasileira de Pneumologia e TisilogiaArticle
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4 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectiveTo compare equations for predicting peak quadriceps femoris (QF) muscle force; to determine the agreement among the equations in identifying QF muscle weakness in COPD patients; and to assess the differences in characteristics among the groups of patients classified as having or not having QF muscle weakness by each equation.
methodsFifty-six COPD patients underwent assessment of peak QF muscle force by dynamometry (maximal voluntary isometric contraction of knee extension). Predicted values were calculated with three equations: an age-height-weight-gender equation (Eq-AHWG); an age-weight-gender equation (Eq-AWG); and an age-fat-free mass-gender equation (Eq-AFFMG).
resultsComparison of the percentage of predicted values obtained with the three equations showed that the Eq-AHWG gave higher values than did the Eq-AWG and Eq-AFFMG, with no difference between the last two. The Eq-AHWG showed moderate agreement with the Eq-AWG and Eq-AFFMG, whereas the last two also showed moderate, albeit lower, agreement with each other. In the sample as a whole, QF muscle weakness (< 80% of predicted) was identified by the Eq-AHWG, Eq-AWG, and Eq-AFFMG in 59%, 68%, and 70% of the patients, respectively (p > 0.05). Age, fat-free mass, and body mass index are characteristics that differentiate between patients with and without QF muscle weakness.
conclusionsThe three equations were statistically equivalent in classifying COPD patients as having or not having QF muscle weakness. However, the Eq-AHWG gave higher peak force values than did the Eq-AWG and the Eq-AFFMG, as well as showing greater agreement with the other equations.
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