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Validity and reliability of strain gauge measurement of volitional quadriceps force in patients with COPD
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Abstract
This study investigated the validity and reliability of fixed
strain gauge measurements of isometric quadriceps force in
patients with chronic obstructive pulmonary disease (COPD). A
total cohort of 138 patients with COPD were assessed. To
determine validity, maximal volitional quadriceps force was
evaluated during isometric maximal voluntary contraction (MVC)
manoeuvre via a fixed strain gauge dynamometer and compared to
(a) potentiated non-volitional quadriceps force obtained via
magnetic stimulation of the femoral nerve (twitch (Tw); n = 92)
and (b) volitional computerized dynamometry (Biodex; n = 46) and
analysed via correlation coefficients. Test-retest and absolute
reliability were determined via calculations of intra-class
correlation coefficients (ICCs), smallest real differences
(SRDs) and standard errors of measurement (SEMs). For this, MVC
recordings in each device were performed across two test
sessions separated by a period of 7 days ( n = 46). Strain gauge
measures of MVC demonstrated very large correlation with Tw and
Biodex results ( r = 0.86 and 0.88, respectively, both p <
0.0001). ICC, SEM and SRD were numerically comparable between
strain gauge and Biodex devices (ICC = 0.96 vs. 0.93; SEM = 8.50
vs. 10.54 N.m and SRD = 23.59 vs. 29.22 N.m, respectively). The
results support that strain gauge measures of quadriceps force
are valid and reliable in patients with COPD.
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MACHADO RODRIGUES, Fernanda, et al. Validity and reliability of strain gauge measurement of
volitional quadriceps force in patients with COPD. Chronic Respiratory Disease. 2017. Vol. 14, num. 3, pags. 289-297. ISSN 1479-9723. [consulted: 15 of June of 2026]. Available at: https://hdl.handle.net/2445/115594