Minimal important difference of quadriceps maximal voluntary contraction (QMVC) in COPD: a prospective cohort study.

A prospective cohort study published in Thorax established the minimal important difference (MID) for quadriceps maximal voluntary contraction (QMVC) in patients with COPD, a clinically meaningful threshold that helps clinicians determine whether changes in quadriceps strength represent genuine patient-relevant improvement. Quadriceps weakness is a common and prognostically significant extrapulmonary feature of COPD, and QMVC is frequently used as an outcome measure in pulmonary rehabilitation research. Identifying a reliable MID for this measure supports more meaningful interpretation of strength gains in both clinical and research settings.

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