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the degree of quadriceps muscle weakness, the equations were statistically equivalent, although the equation proposed by Neder et al.(9) gave higher peak force values and showed greater agreement with the other two equations studied. It is of utmost importance to highlight the clinical relevance of this article(8) for professionals working with patients with lung disease, as well as highlighting that predictive equations for estimating six-minute walk distance,(12-14) shuttle walk distance,(15) and respiratory muscle strength (maximal inspiratory and expiratory pressures) are already available,(16,17) the study by Nellessen et al.(8) has come to compose this scenario. In addition to facilitating the comparison of our data with those by the international scientific community, this will allow us in the near future to propose multicenter studies with an excellent sample size: the Brazilian population. Undertaking to assess COPD patients for physical fitness, functioning, and activities of daily living is not an easy task.(18) For this reason, we should always rely on studies that consistently present predictive equations and reference values that can guide us in proposing new therapeutic interventions to such patients.(3,4) Culturally, we have some difficulty in citing studies of the Brazilian population. In contrast, it is increasingly important today that national journals enjoy greater visibility. Therefore, here is an invitation: appreciate and make use not only of the articles featured by the JBP, but also of those featured by other national journals. I am sure that you will find excellent approaches and data that can be useful in your future studies.

Assessing quadriceps muscle strength as a tool to determine the approach to and prognosis in COPD patients